20-x=3(x+4)

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Solution for 20-x=3(x+4) equation:


Simplifying
20 + -1x = 3(x + 4)

Reorder the terms:
20 + -1x = 3(4 + x)
20 + -1x = (4 * 3 + x * 3)
20 + -1x = (12 + 3x)

Solving
20 + -1x = 12 + 3x

Solving for variable 'x'.

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

Add '-3x' to each side of the equation.
20 + -1x + -3x = 12 + 3x + -3x

Combine like terms: -1x + -3x = -4x
20 + -4x = 12 + 3x + -3x

Combine like terms: 3x + -3x = 0
20 + -4x = 12 + 0
20 + -4x = 12

Add '-20' to each side of the equation.
20 + -20 + -4x = 12 + -20

Combine like terms: 20 + -20 = 0
0 + -4x = 12 + -20
-4x = 12 + -20

Combine like terms: 12 + -20 = -8
-4x = -8

Divide each side by '-4'.
x = 2

Simplifying
x = 2

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