Question

3*(0,4х+5)-7*(0,3х*8)=9

Answer 1

1,2x + 15 - 7 * (0,3х * 8) = 9
1,2х + 15 - 7 * 2,4х = 9
1,2х + 15 - 16,8х = 9
-15,6х + 15 = 9
-15,6х = - 6
х = 50/13
х = 3 11/13

Answer 2

3*(0,4х+5)-7*(0,3х*8)=9
1,2х+15-16,8х=9
-15,6х=9-15
-15,6х=-6
х=-6:(-15,6)
х=50/13
х=3 11/13

Answer 3

To solve this equation, we first need to apply the distributive property to each term inside the parentheses:

3*(0.4x+5) = 1.2x + 15 7*(0.3x*8) = 16.8x

Substituting these values back into the original equation, we get:

1.2x + 15 - 16.8x = 9

Next, we can combine like terms by adding or subtracting coefficients of x:

-15.6x + 15 = 9

Subtracting 15 from both sides of the equation, we get:

-15.6x = -6

Finally, we can solve for x by dividing both sides of the equation by -15.6:

x = (-6) / (-15.6)

Simplifying this expression, we get:

x = 0.3846

Therefore, the solution to the equation 3*(0.4x+5)-7*(0.3x*8)=9 is x = 0.3846.