3x+8+x=90

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Solution for 3x+8+x=90 equation:


Simplifying
3x + 8 + x = 90

Reorder the terms:
8 + 3x + x = 90

Combine like terms: 3x + x = 4x
8 + 4x = 90

Solving
8 + 4x = 90

Solving for variable 'x'.

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

Add '-8' to each side of the equation.
8 + -8 + 4x = 90 + -8

Combine like terms: 8 + -8 = 0
0 + 4x = 90 + -8
4x = 90 + -8

Combine like terms: 90 + -8 = 82
4x = 82

Divide each side by '4'.
x = 20.5

Simplifying
x = 20.5

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