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0.40x+0.05(20-x)=0.10(-4)
We move all terms to the left:
0.40x+0.05(20-x)-(0.10(-4))=0
We add all the numbers together, and all the variables
0.40x+0.05(-1x+20)-(0.10(-4))=0
We add all the numbers together, and all the variables
0.40x+0.05(-1x+20)+0.4=0
We multiply parentheses
0.40x-0.05x+1+0.4=0
We add all the numbers together, and all the variables
0.35x+1.4=0
We move all terms containing x to the left, all other terms to the right
0.35x=-1.4
x=-1.4/0.35
x=-4
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