3x-21=8x+39

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Solution for 3x-21=8x+39 equation:


Simplifying
3x + -21 = 8x + 39

Reorder the terms:
-21 + 3x = 8x + 39

Reorder the terms:
-21 + 3x = 39 + 8x

Solving
-21 + 3x = 39 + 8x

Solving for variable 'x'.

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

Add '-8x' to each side of the equation.
-21 + 3x + -8x = 39 + 8x + -8x

Combine like terms: 3x + -8x = -5x
-21 + -5x = 39 + 8x + -8x

Combine like terms: 8x + -8x = 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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