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209=8m+7(3m+5)
We move all terms to the left:
209-(8m+7(3m+5))=0
We calculate terms in parentheses: -(8m+7(3m+5)), so:We get rid of parentheses
8m+7(3m+5)
We multiply parentheses
8m+21m+35
We add all the numbers together, and all the variables
29m+35
Back to the equation:
-(29m+35)
-29m-35+209=0
We add all the numbers together, and all the variables
-29m+174=0
We move all terms containing m to the left, all other terms to the right
-29m=-174
m=-174/-29
m=+6
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