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0.70x+0.05(12-x)=0.10(-85)
We move all terms to the left:
0.70x+0.05(12-x)-(0.10(-85))=0
We add all the numbers together, and all the variables
0.70x+0.05(-1x+12)-(0.10(-85))=0
We add all the numbers together, and all the variables
0.70x+0.05(-1x+12)+8.5=0
We multiply parentheses
0.70x-0.05x+0.6+8.5=0
We add all the numbers together, and all the variables
0.65x+9.1=0
We move all terms containing x to the left, all other terms to the right
0.65x=-9.1
x=-9.1/0.65
x=-13+0.65/0.65
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