100-x+3x=120

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Solution for 100-x+3x=120 equation: 


Simplifying
100 + -1x + 3x = 120

Combine like terms: -1x + 3x = 2x
100 + 2x = 120

Solving
100 + 2x = 120

Solving for variable 'x'.

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

Add '-100' to each side of the equation.
100 + -100 + 2x = 120 + -100

Combine like terms: 100 + -100 = 0
0 + 2x = 120 + -100
2x = 120 + -100

Combine like terms: 120 + -100 = 20
2x = 20

Divide each side by '2'.
x = 10

Simplifying
x = 10

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