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0.8(220-x)=160
We move all terms to the left:
0.8(220-x)-(160)=0
We add all the numbers together, and all the variables
0.8(-1x+220)-160=0
We multiply parentheses
-0.8x+176-160=0
We add all the numbers together, and all the variables
-0.8x+16=0
We move all terms containing x to the left, all other terms to the right
-0.8x=-16
x=-16/-0.8
x=+20
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