5x+21=2x+18

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Solution for 5x+21=2x+18 equation:


Simplifying
5x + 21 = 2x + 18

Reorder the terms:
21 + 5x = 2x + 18

Reorder the terms:
21 + 5x = 18 + 2x

Solving
21 + 5x = 18 + 2x

Solving for variable 'x'.

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

Add '-2x' to each side of the equation.
21 + 5x + -2x = 18 + 2x + -2x

Combine like terms: 5x + -2x = 3x
21 + 3x = 18 + 2x + -2x

Combine like terms: 2x + -2x = 0
21 + 3x = 18 + 0
21 + 3x = 18

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

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

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

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

Simplifying
x = -1

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