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2.58m+34.23=42.1-142m
We move all terms to the left:
2.58m+34.23-(42.1-142m)=0
We add all the numbers together, and all the variables
2.58m-(-142m+42.1)+34.23=0
We get rid of parentheses
2.58m+142m-42.1+34.23=0
We add all the numbers together, and all the variables
144.58m-7.87=0
We move all terms containing m to the left, all other terms to the right
144.58m=7.87
m=7.87/144.58
m=4.2085561497326/77.31550802139
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