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0.15x+0.10(20-x)=0.12(20)
We move all terms to the left:
0.15x+0.10(20-x)-(0.12(20))=0
We add all the numbers together, and all the variables
0.15x+0.10(-1x+20)-(0.122)=0
We add all the numbers together, and all the variables
0.15x+0.10(-1x+20)-0.122=0
We multiply parentheses
0.15x-0.1x+2-0.122=0
We add all the numbers together, and all the variables
0.05x+1.878=0
We move all terms containing x to the left, all other terms to the right
0.05x=-1.878
x=-1.878/0.05
x=-37+0.028/0.05
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