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7.8+2(0.75m+0.4)=-6.4m+4(-0.8)
We move all terms to the left:
7.8+2(0.75m+0.4)-(-6.4m+4(-0.8))=0
We multiply parentheses
0m-(-6.4m+4(-0.8))+0.8+7.8=0
We calculate terms in parentheses: -(-6.4m+4(-0.8)), so:We add all the numbers together, and all the variables
-6.4m+4(-0.8)
We add all the numbers together, and all the variables
-6.4m-3.2
Back to the equation:
-(-6.4m-3.2)
m-(-6.4m-3.2)+8.6=0
We get rid of parentheses
m+6.4m+3.2+8.6=0
We add all the numbers together, and all the variables
7.4m+11.8=0
We move all terms containing m to the left, all other terms to the right
7.4m=-11.8
m=-11.8/7.4
m=-1+3.1428571428571/5.2857142857143
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