18+3x=21x

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Solution for 18+3x=21x equation:


Simplifying
18 + 3x = 21x

Solving
18 + 3x = 21x

Solving for variable 'x'.

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

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

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

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

Add '-18' to each side of the equation.
18 + -18 + -18x = 0 + -18

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

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

Divide each side by '-18'.
x = 1

Simplifying
x = 1

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