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-m/5-9=21
We move all terms to the left:
-m/5-9-(21)=0
We add all the numbers together, and all the variables
-m/5-30=0
We multiply all the terms by the denominator
-m-30*5=0
We add all the numbers together, and all the variables
-1m-150=0
We move all terms containing m to the left, all other terms to the right
-m=150
m=150/-1
m=-150
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