420=(20-x)+100

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Solution for 420=(20-x)+100 equation:


Simplifying
420 = (20 + -1x) + 100

Remove parenthesis around (20 + -1x)
420 = 20 + -1x + 100

Reorder the terms:
420 = 20 + 100 + -1x

Combine like terms: 20 + 100 = 120
420 = 120 + -1x

Solving
420 = 120 + -1x

Solving for variable 'x'.

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

Add 'x' to each side of the equation.
420 + x = 120 + -1x + x

Combine like terms: -1x + x = 0
420 + x = 120 + 0
420 + x = 120

Add '-420' to each side of the equation.
420 + -420 + x = 120 + -420

Combine like terms: 420 + -420 = 0
0 + x = 120 + -420
x = 120 + -420

Combine like terms: 120 + -420 = -300
x = -300

Simplifying
x = -300

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