21-3x-7=x+20

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Solution for 21-3x-7=x+20 equation:


Simplifying
21 + -3x + -7 = x + 20

Reorder the terms:
21 + -7 + -3x = x + 20

Combine like terms: 21 + -7 = 14
14 + -3x = x + 20

Reorder the terms:
14 + -3x = 20 + x

Solving
14 + -3x = 20 + x

Solving for variable 'x'.

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

Add '-1x' to each side of the equation.
14 + -3x + -1x = 20 + x + -1x

Combine like terms: -3x + -1x = -4x
14 + -4x = 20 + x + -1x

Combine like terms: x + -1x = 0
14 + -4x = 20 + 0
14 + -4x = 20

Add '-14' to each side of the equation.
14 + -14 + -4x = 20 + -14

Combine like terms: 14 + -14 = 0
0 + -4x = 20 + -14
-4x = 20 + -14

Combine like terms: 20 + -14 = 6
-4x = 6

Divide each side by '-4'.
x = -1.5

Simplifying
x = -1.5

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