(3x+3)-(x+7)=-18

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Solution for (3x+3)-(x+7)=-18 equation:


Simplifying
(3x + 3) + -1(x + 7) = -18

Reorder the terms:
(3 + 3x) + -1(x + 7) = -18

Remove parenthesis around (3 + 3x)
3 + 3x + -1(x + 7) = -18

Reorder the terms:
3 + 3x + -1(7 + x) = -18
3 + 3x + (7 * -1 + x * -1) = -18
3 + 3x + (-7 + -1x) = -18

Reorder the terms:
3 + -7 + 3x + -1x = -18

Combine like terms: 3 + -7 = -4
-4 + 3x + -1x = -18

Combine like terms: 3x + -1x = 2x
-4 + 2x = -18

Solving
-4 + 2x = -18

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '4' to each side of the equation.
-4 + 4 + 2x = -18 + 4

Combine like terms: -4 + 4 = 0
0 + 2x = -18 + 4
2x = -18 + 4

Combine like terms: -18 + 4 = -14
2x = -14

Divide each side by '2'.
x = -7

Simplifying
x = -7

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