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-1-4=-13+2M
We move all terms to the left:
-1-4-(-13+2M)=0
We add all the numbers together, and all the variables
-(2M-13)-1-4=0
We add all the numbers together, and all the variables
-(2M-13)-5=0
We get rid of parentheses
-2M+13-5=0
We add all the numbers together, and all the variables
-2M+8=0
We move all terms containing M to the left, all other terms to the right
-2M=-8
M=-8/-2
M=+4
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