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0.10x+0.05(8-x)=0.10(-4)
We move all terms to the left:
0.10x+0.05(8-x)-(0.10(-4))=0
We add all the numbers together, and all the variables
0.10x+0.05(-1x+8)-(0.10(-4))=0
We add all the numbers together, and all the variables
0.10x+0.05(-1x+8)+0.4=0
We multiply parentheses
0.10x-0.05x+0.4+0.4=0
We add all the numbers together, and all the variables
0.05x+0.8=0
We move all terms containing x to the left, all other terms to the right
0.05x=-0.8
x=-0.8/0.05
x=-16
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