18+3x+21=90

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Solution for 18+3x+21=90 equation:


Simplifying
18 + 3x + 21 = 90

Reorder the terms:
18 + 21 + 3x = 90

Combine like terms: 18 + 21 = 39
39 + 3x = 90

Solving
39 + 3x = 90

Solving for variable 'x'.

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

Add '-39' to each side of the equation.
39 + -39 + 3x = 90 + -39

Combine like terms: 39 + -39 = 0
0 + 3x = 90 + -39
3x = 90 + -39

Combine like terms: 90 + -39 = 51
3x = 51

Divide each side by '3'.
x = 17

Simplifying
x = 17

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