12x+21=15x+15

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Solution for 12x+21=15x+15 equation:


Simplifying
12x + 21 = 15x + 15

Reorder the terms:
21 + 12x = 15x + 15

Reorder the terms:
21 + 12x = 15 + 15x

Solving
21 + 12x = 15 + 15x

Solving for variable 'x'.

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

Add '-15x' to each side of the equation.
21 + 12x + -15x = 15 + 15x + -15x

Combine like terms: 12x + -15x = -3x
21 + -3x = 15 + 15x + -15x

Combine like terms: 15x + -15x = 0
21 + -3x = 15 + 0
21 + -3x = 15

Add '-21' to each side of the equation.
21 + -21 + -3x = 15 + -21

Combine like terms: 21 + -21 = 0
0 + -3x = 15 + -21
-3x = 15 + -21

Combine like terms: 15 + -21 = -6
-3x = -6

Divide each side by '-3'.
x = 2

Simplifying
x = 2

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