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320=7y-4
We move all terms to the left:
320-(7y-4)=0
We get rid of parentheses
-7y+4+320=0
We add all the numbers together, and all the variables
-7y+324=0
We move all terms containing y to the left, all other terms to the right
-7y=-324
y=-324/-7
y=46+2/7
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