20+78+90+x=180

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Solution for 20+78+90+x=180 equation: 


Simplifying
20 + 78 + 90 + x = 180

Combine like terms: 20 + 78 = 98
98 + 90 + x = 180

Combine like terms: 98 + 90 = 188
188 + x = 180

Solving
188 + x = 180

Solving for variable 'x'.

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

Add '-188' to each side of the equation.
188 + -188 + x = 180 + -188

Combine like terms: 188 + -188 = 0
0 + x = 180 + -188
x = 180 + -188

Combine like terms: 180 + -188 = -8
x = -8

Simplifying
x = -8

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