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-(m+3)=-8
We simplify the equation to the form, which is simple to understand
-(m+3)=-8
Remove unnecessary parentheses
-1m-3=-8
We move all terms containing m to the left and all other terms to the right.
-1m=-8+3
We simplify left and right side of the equation.
-1m=-5
We divide both sides of the equation by -1 to get m.
m=5
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