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.8(180-y)+.84y=120
We move all terms to the left:
.8(180-y)+.84y-(120)=0
We add all the numbers together, and all the variables
.8(-1y+180)+.84y-120=0
We add all the numbers together, and all the variables
.84y+.8(-1y+180)-120=0
We multiply parentheses
.84y-0.8y+144-120=0
We add all the numbers together, and all the variables
0.04y+24=0
We move all terms containing y to the left, all other terms to the right
0.04y=-24
y=-24/0.04
y=-600
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