3(x-7)-x=2x-21

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Solution for 3(x-7)-x=2x-21 equation:


Simplifying
3(x + -7) + -1x = 2x + -21

Reorder the terms:
3(-7 + x) + -1x = 2x + -21
(-7 * 3 + x * 3) + -1x = 2x + -21
(-21 + 3x) + -1x = 2x + -21

Combine like terms: 3x + -1x = 2x
-21 + 2x = 2x + -21

Reorder the terms:
-21 + 2x = -21 + 2x

Add '21' to each side of the equation.
-21 + 21 + 2x = -21 + 21 + 2x

Combine like terms: -21 + 21 = 0
0 + 2x = -21 + 21 + 2x
2x = -21 + 21 + 2x

Combine like terms: -21 + 21 = 0
2x = 0 + 2x
2x = 2x

Add '-2x' to each side of the equation.
2x + -2x = 2x + -2x

Combine like terms: 2x + -2x = 0
0 = 2x + -2x

Combine like terms: 2x + -2x = 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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