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6y-42=-7y+49
We move all terms to the left:
6y-42-(-7y+49)=0
We get rid of parentheses
6y+7y-49-42=0
We add all the numbers together, and all the variables
13y-91=0
We move all terms containing y to the left, all other terms to the right
13y=91
y=91/13
y=7
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