10+3+x=90

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Solution for 10+3+x=90 equation: 


Simplifying
10 + 3 + x = 90

Combine like terms: 10 + 3 = 13
13 + x = 90

Solving
13 + x = 90

Solving for variable 'x'.

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

Add '-13' to each side of the equation.
13 + -13 + x = 90 + -13

Combine like terms: 13 + -13 = 0
0 + x = 90 + -13
x = 90 + -13

Combine like terms: 90 + -13 = 77
x = 77

Simplifying
x = 77

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