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12-3y=4(5-7)
We move all terms to the left:
12-3y-(4(5-7))=0
We add all the numbers together, and all the variables
-3y+12-(4(-2))=0
We add all the numbers together, and all the variables
-3y+20=0
We move all terms containing y to the left, all other terms to the right
-3y=-20
y=-20/-3
y=6+2/3
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