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0.4(20-10m)=2.5-2m=12.5
We move all terms to the left:
0.4(20-10m)-(2.5-2m)=0
We add all the numbers together, and all the variables
0.4(-10m+20)-(-2m+2.5)=0
We multiply parentheses
-4m-(-2m+2.5)+8=0
We get rid of parentheses
-4m+2m-2.5+8=0
We add all the numbers together, and all the variables
-2m+5.5=0
We move all terms containing m to the left, all other terms to the right
-2m=-5.5
m=-5.5/-2
m=2+1/1.3333333333333
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