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0.9(x+80)+.3x=108
We move all terms to the left:
0.9(x+80)+.3x-(108)=0
We add all the numbers together, and all the variables
.3x+0.9(x+80)-108=0
We multiply parentheses
.3x+0.9x+72-108=0
We add all the numbers together, and all the variables
1.2x-36=0
We move all terms containing x to the left, all other terms to the right
1.2x=36
x=36/1.2
x=30
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