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-3m-20-8(m-1)=2m-(9m-5)-7m+1
We simplify the equation to the form, which is simple to understand
-3m-20-8(m-1)=2m-(9m-5)-7m+1
Reorder the terms in parentheses
-3m-20+(-8m+8)=2m-(9m-5)-7m+1
Remove unnecessary parentheses
-3m-20-8m+8=+2m-(+9m-5+)-7m+1
Remove unnecessary parentheses
-3m-20-8m+8=2m-9m+5-7m+1
We move all terms containing m to the left and all other terms to the right.
-3m-8m-2m+9m+7m=+5+1+20-8
We simplify left and right side of the equation.
+3m=+18
We divide both sides of the equation by 3 to get m.
m=6
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