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 = 18x
-51 + 18x = 21 + -3x + 3x

Combine like terms: -3x + 3x = 0
-51 + 18x = 21 + 0
-51 + 18x = 21

Add '51' to each side of the equation.
-51 + 51 + 18x = 21 + 51

Combine like terms: -51 + 51 = 0
0 + 18x = 21 + 51
18x = 21 + 51

Combine like terms: 21 + 51 = 72
18x = 72

Divide each side by '18'.
x = 4

Simplifying
x = 4

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