1-(-7)=4

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Solution for 1-(-7)=4 equation: 


Simplifying
1 + -1(-7) = 4

Multiply -1 * -7
1 + 7 = 4

Combine like terms: 1 + 7 = 8
8 = 4

Solving
8 = 4

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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