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7.8+2(0.75m+0.4)=-6.4m+4(0.5-0.8)
We move all terms to the left:
7.8+2(0.75m+0.4)-(-6.4m+4(0.5-0.8))=0
We add all the numbers together, and all the variables
2(0.75m+0.4)-(-6.4m+4(-0.3))+7.8=0
We multiply parentheses
0m-(-6.4m+4(-0.3))+0.8+7.8=0
We calculate terms in parentheses: -(-6.4m+4(-0.3)), so:We add all the numbers together, and all the variables
-6.4m+4(-0.3)
We add all the numbers together, and all the variables
-6.4m-1.2
Back to the equation:
-(-6.4m-1.2)
m-(-6.4m-1.2)+8.6=0
We get rid of parentheses
m+6.4m+1.2+8.6=0
We add all the numbers together, and all the variables
7.4m+9.8=0
We move all terms containing m to the left, all other terms to the right
7.4m=-9.8
m=-9.8/7.4
m=-1+2.4/7.4
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