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3(3y+4y-7)=42
We move all terms to the left:
3(3y+4y-7)-(42)=0
We add all the numbers together, and all the variables
3(7y-7)-42=0
We multiply parentheses
21y-21-42=0
We add all the numbers together, and all the variables
21y-63=0
We move all terms containing y to the left, all other terms to the right
21y=63
y=63/21
y=3
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