3x-18=21

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Solution for 3x-18=21 equation: 


Simplifying
3x + -18 = 21

Reorder the terms:
-18 + 3x = 21

Solving
-18 + 3x = 21

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 + 3x = 21 + 18

Combine like terms: -18 + 18 = 0
0 + 3x = 21 + 18
3x = 21 + 18

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

Divide each side by '3'.
x = 13

Simplifying
x = 13

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