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0.05x-0.07(100-x)=1.4
We move all terms to the left:
0.05x-0.07(100-x)-(1.4)=0
We add all the numbers together, and all the variables
0.05x-0.07(-1x+100)-(1.4)=0
We add all the numbers together, and all the variables
0.05x-0.07(-1x+100)-1.4=0
We multiply parentheses
0.05x+0.07x-7-1.4=0
We add all the numbers together, and all the variables
0.12x-8.4=0
We move all terms containing x to the left, all other terms to the right
0.12x=8.4
x=8.4/0.12
x=70
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