120=100-4(x+20)

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Solution for 120=100-4(x+20) equation:


Simplifying
120 = 100 + -4(x + 20)

Reorder the terms:
120 = 100 + -4(20 + x)
120 = 100 + (20 * -4 + x * -4)
120 = 100 + (-80 + -4x)

Combine like terms: 100 + -80 = 20
120 = 20 + -4x

Solving
120 = 20 + -4x

Solving for variable 'x'.

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

Add '4x' to each side of the equation.
120 + 4x = 20 + -4x + 4x

Combine like terms: -4x + 4x = 0
120 + 4x = 20 + 0
120 + 4x = 20

Add '-120' to each side of the equation.
120 + -120 + 4x = 20 + -120

Combine like terms: 120 + -120 = 0
0 + 4x = 20 + -120
4x = 20 + -120

Combine like terms: 20 + -120 = -100
4x = -100

Divide each side by '4'.
x = -25

Simplifying
x = -25

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