x+20=4(x-100)

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


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

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

Reorder the terms:
20 + x = 4(-100 + x)
20 + x = (-100 * 4 + x * 4)
20 + x = (-400 + 4x)

Solving
20 + x = -400 + 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.
20 + x + -4x = -400 + 4x + -4x

Combine like terms: x + -4x = -3x
20 + -3x = -400 + 4x + -4x

Combine like terms: 4x + -4x = 0
20 + -3x = -400 + 0
20 + -3x = -400

Add '-20' to each side of the equation.
20 + -20 + -3x = -400 + -20

Combine like terms: 20 + -20 = 0
0 + -3x = -400 + -20
-3x = -400 + -20

Combine like terms: -400 + -20 = -420
-3x = -420

Divide each side by '-3'.
x = 140

Simplifying
x = 140

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