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19=100+20M
We move all terms to the left:
19-(100+20M)=0
We add all the numbers together, and all the variables
-(20M+100)+19=0
We get rid of parentheses
-20M-100+19=0
We add all the numbers together, and all the variables
-20M-81=0
We move all terms containing M to the left, all other terms to the right
-20M=81
M=81/-20
M=-4+1/20
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