15x-51=3x+21

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Solution for 15x-51=3x+21 equation:


Simplifying
15x + -51 = 3x + 21

Reorder the terms:
-51 + 15x = 3x + 21

Reorder the terms:
-51 + 15x = 21 + 3x

Solving
-51 + 15x = 21 + 3x

Solving for variable 'x'.

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

Add '-3x' to each side of the equation.
-51 + 15x + -3x = 21 + 3x + -3x

Combine like terms: 15x + -3x = 12x
-51 + 12x = 21 + 3x + -3x

Combine like terms: 3x + -3x = 0
-51 + 12x = 21 + 0
-51 + 12x = 21

Add '51' to each side of the equation.
-51 + 51 + 12x = 21 + 51

Combine like terms: -51 + 51 = 0
0 + 12x = 21 + 51
12x = 21 + 51

Combine like terms: 21 + 51 = 72
12x = 72

Divide each side by '12'.
x = 6

Simplifying
x = 6

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