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

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


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

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

Reorder the terms:
-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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