3x-13+x-21=90

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Solution for 3x-13+x-21=90 equation:


Simplifying
3x + -13 + x + -21 = 90

Reorder the terms:
-13 + -21 + 3x + x = 90

Combine like terms: -13 + -21 = -34
-34 + 3x + x = 90

Combine like terms: 3x + x = 4x
-34 + 4x = 90

Solving
-34 + 4x = 90

Solving for variable 'x'.

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

Add '34' to each side of the equation.
-34 + 34 + 4x = 90 + 34

Combine like terms: -34 + 34 = 0
0 + 4x = 90 + 34
4x = 90 + 34

Combine like terms: 90 + 34 = 124
4x = 124

Divide each side by '4'.
x = 31

Simplifying
x = 31

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