20-40+x=100

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Solution for 20-40+x=100 equation: 


Simplifying
20 + -40 + x = 100

Combine like terms: 20 + -40 = -20
-20 + x = 100

Solving
-20 + x = 100

Solving for variable 'x'.

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

Add '20' to each side of the equation.
-20 + 20 + x = 100 + 20

Combine like terms: -20 + 20 = 0
0 + x = 100 + 20
x = 100 + 20

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

Simplifying
x = 120

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