15x-21=4x+12

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Solution for 15x-21=4x+12 equation:


Simplifying
15x + -21 = 4x + 12

Reorder the terms:
-21 + 15x = 4x + 12

Reorder the terms:
-21 + 15x = 12 + 4x

Solving
-21 + 15x = 12 + 4x

Solving for variable 'x'.

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

Add '-4x' to each side of the equation.
-21 + 15x + -4x = 12 + 4x + -4x

Combine like terms: 15x + -4x = 11x
-21 + 11x = 12 + 4x + -4x

Combine like terms: 4x + -4x = 0
-21 + 11x = 12 + 0
-21 + 11x = 12

Add '21' to each side of the equation.
-21 + 21 + 11x = 12 + 21

Combine like terms: -21 + 21 = 0
0 + 11x = 12 + 21
11x = 12 + 21

Combine like terms: 12 + 21 = 33
11x = 33

Divide each side by '11'.
x = 3

Simplifying
x = 3

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