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0.25x+0.5(160-x)=64
We move all terms to the left:
0.25x+0.5(160-x)-(64)=0
We add all the numbers together, and all the variables
0.25x+0.5(-1x+160)-64=0
We multiply parentheses
0.25x-0.5x+80-64=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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