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7.8+2(0.75m+0.4)=6.4m+4(0.5m+0.8)
We move all terms to the left:
7.8+2(0.75m+0.4)-(6.4m+4(0.5m+0.8))=0
We multiply parentheses
0m-(6.4m+4(0.5m+0.8))+0.8+7.8=0
We calculate terms in parentheses: -(6.4m+4(0.5m+0.8)), so:We add all the numbers together, and all the variables
6.4m+4(0.5m+0.8)
We multiply parentheses
6.4m+0m+3.2
We add all the numbers together, and all the variables
7.4m+3.2
Back to the equation:
-(7.4m+3.2)
m-(7.4m+3.2)+8.6=0
We get rid of parentheses
m-7.4m-3.2+8.6=0
We add all the numbers together, and all the variables
-6.4m+5.4=0
We move all terms containing m to the left, all other terms to the right
-6.4m=-5.4
m=-5.4/-6.4
m=3.85714285714/4.57142857143
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