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.04x+.07(100-x)=5
We move all terms to the left:
.04x+.07(100-x)-(5)=0
We add all the numbers together, and all the variables
.04x+.07(-1x+100)-5=0
We multiply parentheses
.04x-0.07x+7-5=0
We add all the numbers together, and all the variables
-0.03x+2=0
We move all terms containing x to the left, all other terms to the right
-0.03x=-2
x=-2/-0.03
x=66+0.02/0.03
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