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+M+12=3M+2
We move all terms to the left:
+M+12-(3M+2)=0
We get rid of parentheses
M-3M-2+12=0
We add all the numbers together, and all the variables
-2M+10=0
We move all terms containing M to the left, all other terms to the right
-2M=-10
M=-10/-2
M=+5
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