Question

2. 12,3 – (х + 8,7) = 6,9 3. 6 – 3(х + 1) = 7 - х 4. (8х + 3) – (10х + 6) = 9 5. 0,3(6 - 3х) = 4,5 – 0,8(х - 9)

Answer 1

Ответ:

Пошаговое объяснение:

Answer 2

Let's solve each equation step by step:

2. $12.3 - (x + 8.7) = 6.9$

First, distribute the negative sign on the left side of the equation:

$12.3 - x - 8.7 = 6.9$

Now, combine like terms:

$-x + 3.6 = 6.9$

Subtract 3.6 from both sides to isolate the variable:

$-x = 6.9 - 3.6$

$-x = 3.3$

Now, multiply both sides by -1 to solve for x:

$x = -3.3$

3. $6 - 3(x + 1) = 7 - x$

First, distribute the -3 on the left side:

$6 - 3x - 3 = 7 - x$

Now, combine like terms:

$-3x + 3x + 6 - 3 = 7 - x$

$6 - 3 = 7 - x$

$3 = 7 - x$

Now, subtract 7 from both sides to isolate the variable:

$3 - 7 = -x$

$-4 = -x$

Now, multiply both sides by -1 to solve for x:

$x = 4$

4. $8x + 3 - (10x + 6) = 9$

First, distribute the negative sign on the left side:

$8x + 3 - 10x - 6 = 9$

Now, combine like terms:

$(8x - 10x) + (3 - 6) = 9$

$-2x - 3 = 9$

Add 3 to both sides to isolate the variable:

$-2x = 9 + 3$

$-2x = 12$

Now, divide both sides by -2 to solve for x:

$x = -6$

5. $0.3(6 - 3x) = 4.5 - 0.8(x - 9)$

First, distribute on both sides of the equation:

$0.3 * 6 - 0.3 * 3x = 4.5 - 0.8 * x + 0.8 * 9$

$1.8 - 0.9x = 4.5 - 0.8x + 7.2$

Now, combine like terms:

$-0.9x + 0.8x = 4.5 + 7.2 - 1.8$

$-0.1x = 10.8 - 1.8$

$-0.1x = 9.0$

Now, divide both sides by -0.1 to solve for x:

$x = -90.0$

So the solutions for the equations are:

1. $x = -3.3$
2. $x = 4$
3. $x = -6$
4. $x = -90.0$