2x+18=x+21

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Solution for 2x+18=x+21 equation:


Simplifying
2x + 18 = x + 21

Reorder the terms:
18 + 2x = x + 21

Reorder the terms:
18 + 2x = 21 + x

Solving
18 + 2x = 21 + x

Solving for variable 'x'.

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

Add '-1x' to each side of the equation.
18 + 2x + -1x = 21 + x + -1x

Combine like terms: 2x + -1x = 1x
18 + 1x = 21 + x + -1x

Combine like terms: x + -1x = 0
18 + 1x = 21 + 0
18 + 1x = 21

Add '-18' to each side of the equation.
18 + -18 + 1x = 21 + -18

Combine like terms: 18 + -18 = 0
0 + 1x = 21 + -18
1x = 21 + -18

Combine like terms: 21 + -18 = 3
1x = 3

Divide each side by '1'.
x = 3

Simplifying
x = 3

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