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0.85x+0.05(18-x)=0.10(-39)
We move all terms to the left:
0.85x+0.05(18-x)-(0.10(-39))=0
We add all the numbers together, and all the variables
0.85x+0.05(-1x+18)-(0.10(-39))=0
We add all the numbers together, and all the variables
0.85x+0.05(-1x+18)+3.9=0
We multiply parentheses
0.85x-0.05x+0.9+3.9=0
We add all the numbers together, and all the variables
0.8x+4.8=0
We move all terms containing x to the left, all other terms to the right
0.8x=-4.8
x=-4.8/0.8
x=-5+0.8/0.8
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