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.25(x+80)=320
We move all terms to the left:
.25(x+80)-(320)=0
We multiply parentheses
0.25x+20-320=0
We add all the numbers together, and all the variables
0.25x-300=0
We move all terms containing x to the left, all other terms to the right
0.25x=300
x=300/0.25
x=1200
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