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0.10x+0.05(4-x)=0.10(-7)
We move all terms to the left:
0.10x+0.05(4-x)-(0.10(-7))=0
We add all the numbers together, and all the variables
0.10x+0.05(-1x+4)-(0.10(-7))=0
We add all the numbers together, and all the variables
0.10x+0.05(-1x+4)+0.7=0
We multiply parentheses
0.10x-0.05x+0.2+0.7=0
We add all the numbers together, and all the variables
0.05x+0.9=0
We move all terms containing x to the left, all other terms to the right
0.05x=-0.9
x=-0.9/0.05
x=-18
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