5+13+x=90

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Solution for 5+13+x=90 equation: 


Simplifying
5 + 13 + x = 90

Combine like terms: 5 + 13 = 18
18 + x = 90

Solving
18 + x = 90

Solving for variable 'x'.

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

Add '-18' to each side of the equation.
18 + -18 + x = 90 + -18

Combine like terms: 18 + -18 = 0
0 + x = 90 + -18
x = 90 + -18

Combine like terms: 90 + -18 = 72
x = 72

Simplifying
x = 72

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