90+21+x=180

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Solution for 90+21+x=180 equation: 


Simplifying
90 + 21 + x = 180

Combine like terms: 90 + 21 = 111
111 + x = 180

Solving
111 + x = 180

Solving for variable 'x'.

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

Add '-111' to each side of the equation.
111 + -111 + x = 180 + -111

Combine like terms: 111 + -111 = 0
0 + x = 180 + -111
x = 180 + -111

Combine like terms: 180 + -111 = 69
x = 69

Simplifying
x = 69

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