Question

1)3x+4= 15x-20 2)(7x-5)*2=20 3)1,2x+30=0,8x-20 4)15x-10x+15=4x-10 5)x+2/3 - 2x-3/9=2

Answer 1

1)3х-15х=-20-4
-12х=-24
х=2
2)14х-10=20
14х=20+10
14х=30
х=30/14
3)1,2х-0,8х=-20-30
0,4х=-50
х=125
4)15х-10х+15х-4х=-10
16х=-10
х=-10/16
5)х-2х=2-2/3+3/9
х=1

Answer 2

1. To solve for x, we can simplify and rearrange the equation as follows: 3x + 4 = 15x - 20 Subtracting 3x from both sides: 4 = 12x - 20 Adding 20 to both sides: 24 = 12x Dividing both sides by 12: x = 2

Therefore, the solution is x = 2.

2. To solve for x, we can simplify and rearrange the equation as follows: (7x - 5)*2 = 20 Distributing the 2: 14x - 10 = 20 Adding 10 to both sides: 14x = 30 Dividing both sides by 14: x = 30/14

Therefore, the solution is x = 15/7 or approximately 2.14.

3. To solve for x, we can simplify and rearrange the equation as follows: 1.2x + 30 = 0.8x - 20 Subtracting 0.8x from both sides: 0.4x + 30 = -20 Subtracting 30 from both sides: 0.4x = -50 Dividing both sides by 0.4: x = -125

Therefore, the solution is x = -125.

4. To solve for x, we can simplify and rearrange the equation as follows: 15x - 10x + 15 = 4x - 10 Combining like terms: 5x + 15 = 4x - 10 Subtracting 4x from both sides: x + 15 = -10 Subtracting 15 from both sides: x = -25

Therefore, the solution is x = -25.

5. To solve for x, we can simplify and rearrange the equation as follows: x + 2/3 - 2x - 3/9 = 2 Combining like terms: x - 4x + 2/3 - 3/9 = 2 Simplifying the fractions: x - 3x + 6/9 - 1/3 = 2 Combining like terms: -2x + 5/9 = 2 Subtracting 5/9 from both sides: -2x = 13/9 Dividing both sides by -2: x = -13/18

Therefore, the solution is x = -13/18 or approximately -0.72.