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18=12-(m+3)
We simplify the equation to the form, which is simple to understand
18=12-(m+3)
Remove unnecessary parentheses
18=12-1m-3
We move all terms containing m to the left and all other terms to the right.
+1m=+12-3-18
We simplify left and right side of the equation.
+1m=-9
We divide both sides of the equation by 01 to get m.
m=-9
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