18=3x+21

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Solution for 18=3x+21 equation:


Simplifying
18 = 3x + 21

Reorder the terms:
18 = 21 + 3x

Solving
18 = 21 + 3x

Solving for variable 'x'.

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

Add '-3x' to each side of the equation.
18 + -3x = 21 + 3x + -3x

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

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 = 3
-3x = 3

Divide each side by '-3'.
x = -1

Simplifying
x = -1

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