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0.20x+0.05(12-x)=0.10(-3)
We move all terms to the left:
0.20x+0.05(12-x)-(0.10(-3))=0
We add all the numbers together, and all the variables
0.20x+0.05(-1x+12)-(0.10(-3))=0
We add all the numbers together, and all the variables
0.20x+0.05(-1x+12)+0.3=0
We multiply parentheses
0.20x-0.05x+0.6+0.3=0
We add all the numbers together, and all the variables
0.15x+0.9=0
We move all terms containing x to the left, all other terms to the right
0.15x=-0.9
x=-0.9/0.15
x=-6+1.11022302463E-16/0.15
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