12x-21=7x+39

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Solution for 12x-21=7x+39 equation:


Simplifying
12x + -21 = 7x + 39

Reorder the terms:
-21 + 12x = 7x + 39

Reorder the terms:
-21 + 12x = 39 + 7x

Solving
-21 + 12x = 39 + 7x

Solving for variable 'x'.

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

Add '-7x' to each side of the equation.
-21 + 12x + -7x = 39 + 7x + -7x

Combine like terms: 12x + -7x = 5x
-21 + 5x = 39 + 7x + -7x

Combine like terms: 7x + -7x = 0
-21 + 5x = 39 + 0
-21 + 5x = 39

Add '21' to each side of the equation.
-21 + 21 + 5x = 39 + 21

Combine like terms: -21 + 21 = 0
0 + 5x = 39 + 21
5x = 39 + 21

Combine like terms: 39 + 21 = 60
5x = 60

Divide each side by '5'.
x = 12

Simplifying
x = 12

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