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

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


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

Combine like terms: 7 + -7 = 0
3(0) + -7 = 2(7) + -21

Multiply 3 * 0
0 + -7 = 2(7) + -21

Anything times zero is zero.
0 + -7 = 2(7) + -21

Combine like terms: 0 + -7 = -7
-7 = 2(7) + -21

Multiply 2 * 7
-7 = 14 + -21

Combine like terms: 14 + -21 = -7
-7 = -7

Add '7' to each side of the equation.
-7 + 7 = -7 + 7

Combine like terms: -7 + 7 = 0
0 = -7 + 7

Combine like terms: -7 + 7 = 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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