31+x+4=90

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Solution for 31+x+4=90 equation: 


Simplifying
31 + x + 4 = 90

Reorder the terms:
31 + 4 + x = 90

Combine like terms: 31 + 4 = 35
35 + x = 90

Solving
35 + x = 90

Solving for variable 'x'.

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

Add '-35' to each side of the equation.
35 + -35 + x = 90 + -35

Combine like terms: 35 + -35 = 0
0 + x = 90 + -35
x = 90 + -35

Combine like terms: 90 + -35 = 55
x = 55

Simplifying
x = 55

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