15x-21=39+3x

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Solution for 15x-21=39+3x equation:


Simplifying
15x + -21 = 39 + 3x

Reorder the terms:
-21 + 15x = 39 + 3x

Solving
-21 + 15x = 39 + 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.
-21 + 15x + -3x = 39 + 3x + -3x

Combine like terms: 15x + -3x = 12x
-21 + 12x = 39 + 3x + -3x

Combine like terms: 3x + -3x = 0
-21 + 12x = 39 + 0
-21 + 12x = 39

Add '21' to each side of the equation.
-21 + 21 + 12x = 39 + 21

Combine like terms: -21 + 21 = 0
0 + 12x = 39 + 21
12x = 39 + 21

Combine like terms: 39 + 21 = 60
12x = 60

Divide each side by '12'.
x = 5

Simplifying
x = 5

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