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12+1.50y=19+.80y
We move all terms to the left:
12+1.50y-(19+.80y)=0
We add all the numbers together, and all the variables
1.50y-(.80y+19)+12=0
We get rid of parentheses
1.50y-.80y-19+12=0
We add all the numbers together, and all the variables
0.7y-7=0
We move all terms containing y to the left, all other terms to the right
0.7y=7
y=7/0.7
y=10
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