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-7(1-7m)-8(-5m-8)=57
We move all terms to the left:
-7(1-7m)-8(-5m-8)-(57)=0
We add all the numbers together, and all the variables
-7(-7m+1)-8(-5m-8)-57=0
We multiply parentheses
49m+40m-7+64-57=0
We add all the numbers together, and all the variables
89m=0
m=0/89
m=0
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