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0.35x+0.05(20-x)=0.10(-2)
We move all terms to the left:
0.35x+0.05(20-x)-(0.10(-2))=0
We add all the numbers together, and all the variables
0.35x+0.05(-1x+20)-(0.10(-2))=0
We add all the numbers together, and all the variables
0.35x+0.05(-1x+20)+0.2=0
We multiply parentheses
0.35x-0.05x+1+0.2=0
We add all the numbers together, and all the variables
0.3x+1.2=0
We move all terms containing x to the left, all other terms to the right
0.3x=-1.2
x=-1.2/0.3
x=-4
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