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6(y+y)=78
We move all terms to the left:
6(y+y)-(78)=0
We add all the numbers together, and all the variables
6(+2y)-78=0
We multiply parentheses
12y-78=0
We move all terms containing y to the left, all other terms to the right
12y=78
y=78/12
y=6+1/2
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