9x-21=3(1x-7)+6x

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Solution for 9x-21=3(1x-7)+6x equation: 


Simplifying
9x + -21 = 3(1x + -7) + 6x

Reorder the terms:
-21 + 9x = 3(1x + -7) + 6x

Reorder the terms:
-21 + 9x = 3(-7 + 1x) + 6x
-21 + 9x = (-7 * 3 + 1x * 3) + 6x
-21 + 9x = (-21 + 3x) + 6x

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

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

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

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

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

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

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

Solving
0 = 0

Couldn't find a variable to solve for.

This equation is an identity, all real numbers are solutions.

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