(18-3x)-(12-x)=20

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Solution for (18-3x)-(12-x)=20 equation:


Simplifying
(18 + -3x) + -1(12 + -1x) = 20

Remove parenthesis around (18 + -3x)
18 + -3x + -1(12 + -1x) = 20
18 + -3x + (12 * -1 + -1x * -1) = 20
18 + -3x + (-12 + 1x) = 20

Reorder the terms:
18 + -12 + -3x + 1x = 20

Combine like terms: 18 + -12 = 6
6 + -3x + 1x = 20

Combine like terms: -3x + 1x = -2x
6 + -2x = 20

Solving
6 + -2x = 20

Solving for variable 'x'.

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

Add '-6' to each side of the equation.
6 + -6 + -2x = 20 + -6

Combine like terms: 6 + -6 = 0
0 + -2x = 20 + -6
-2x = 20 + -6

Combine like terms: 20 + -6 = 14
-2x = 14

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

Simplifying
x = -7

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