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0.10x+0.15(20-x)=0.12(20)
We move all terms to the left:
0.10x+0.15(20-x)-(0.12(20))=0
We add all the numbers together, and all the variables
0.10x+0.15(-1x+20)-(0.122)=0
We add all the numbers together, and all the variables
0.10x+0.15(-1x+20)-0.122=0
We multiply parentheses
0.10x-0.15x+3-0.122=0
We add all the numbers together, and all the variables
-0.05x+2.878=0
We move all terms containing x to the left, all other terms to the right
-0.05x=-2.878
x=-2.878/-0.05
x=57+0.028/0.05
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