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-20+2-10m=-6m+18
We move all terms to the left:
-20+2-10m-(-6m+18)=0
We add all the numbers together, and all the variables
-10m-(-6m+18)-18=0
We get rid of parentheses
-10m+6m-18-18=0
We add all the numbers together, and all the variables
-4m-36=0
We move all terms containing m to the left, all other terms to the right
-4m=36
m=36/-4
m=-9
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