7-7+8-(-4)+3-21=

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Solution for 7-7+8-(-4)+3-21= equation: 


Simplifying
7 + -7 + 8 + -1(-4) + 3 + -21 = 0

Multiply -1 * -4
7 + -7 + 8 + 4 + 3 + -21 = 0

Combine like terms: 7 + -7 = 0
0 + 8 + 4 + 3 + -21 = 0
8 + 4 + 3 + -21 = 0

Combine like terms: 8 + 4 = 12
12 + 3 + -21 = 0

Combine like terms: 12 + 3 = 15
15 + -21 = 0

Combine like terms: 15 + -21 = -6
-6 = 0

Solving
-6 = 0

Couldn't find a variable to solve for.

This equation is invalid, the left and right sides are not equal, therefore there is no solution.

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