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=8.7M-56
We move all terms to the left:
-(8.7M-56)=0
We get rid of parentheses
-8.7M+56=0
We move all terms containing M to the left, all other terms to the right
-8.7M=-56
M=-56/-8.7
M=6+2.1111111111111/4.8333333333333
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