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y=21-3/12-3
We move all terms to the left:
y-(21-3/12-3)=0
We add all the numbers together, and all the variables
y-(-3/12+18)=0
We get rid of parentheses
y-18+3/12=0
We multiply all the terms by the denominator
y*12+3-18*12=0
We add all the numbers together, and all the variables
y*12-213=0
Wy multiply elements
12y-213=0
We move all terms containing y to the left, all other terms to the right
12y=213
y=213/12
y=17+3/4
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