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0.20x+0.05(4-x)=0.10(-19)
We move all terms to the left:
0.20x+0.05(4-x)-(0.10(-19))=0
We add all the numbers together, and all the variables
0.20x+0.05(-1x+4)-(0.10(-19))=0
We add all the numbers together, and all the variables
0.20x+0.05(-1x+4)+1.9=0
We multiply parentheses
0.20x-0.05x+0.2+1.9=0
We add all the numbers together, and all the variables
0.15x+2.1=0
We move all terms containing x to the left, all other terms to the right
0.15x=-2.1
x=-2.1/0.15
x=-14
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