100+3x+x=180

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Solution for 100+3x+x=180 equation: 


Simplifying
100 + 3x + x = 180

Combine like terms: 3x + x = 4x
100 + 4x = 180

Solving
100 + 4x = 180

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 + 4x = 180 + -100

Combine like terms: 100 + -100 = 0
0 + 4x = 180 + -100
4x = 180 + -100

Combine like terms: 180 + -100 = 80
4x = 80

Divide each side by '4'.
x = 20

Simplifying
x = 20

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