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7+19m-3=9m+140-7m
We move all terms to the left:
7+19m-3-(9m+140-7m)=0
We add all the numbers together, and all the variables
19m-(2m+140)+7-3=0
We add all the numbers together, and all the variables
19m-(2m+140)+4=0
We get rid of parentheses
19m-2m-140+4=0
We add all the numbers together, and all the variables
17m-136=0
We move all terms containing m to the left, all other terms to the right
17m=136
m=136/17
m=8
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