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0.7x+(0.95)(80-x)=(0.75)(80)
We move all terms to the left:
0.7x+(0.95)(80-x)-((0.75)(80))=0
We add all the numbers together, and all the variables
0.7x+(0.95)(-1x+80)-((0.75)80)=0
We add all the numbers together, and all the variables
0.7x+(0.95)(-1x+80)-60=0
We multiply parentheses ..
0.7x+(-0.95x+76)-60=0
We get rid of parentheses
0.7x-0.95x+76-60=0
We add all the numbers together, and all the variables
-0.25x+16=0
We move all terms containing x to the left, all other terms to the right
-0.25x=-16
x=-16/-0.25
x=+64
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