138-6x=3x+21

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Solution for 138-6x=3x+21 equation:


Simplifying
138 + -6x = 3x + 21

Reorder the terms:
138 + -6x = 21 + 3x

Solving
138 + -6x = 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.
138 + -6x + -3x = 21 + 3x + -3x

Combine like terms: -6x + -3x = -9x
138 + -9x = 21 + 3x + -3x

Combine like terms: 3x + -3x = 0
138 + -9x = 21 + 0
138 + -9x = 21

Add '-138' to each side of the equation.
138 + -138 + -9x = 21 + -138

Combine like terms: 138 + -138 = 0
0 + -9x = 21 + -138
-9x = 21 + -138

Combine like terms: 21 + -138 = -117
-9x = -117

Divide each side by '-9'.
x = 13

Simplifying
x = 13

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