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4y-7=(4+9)
We move all terms to the left:
4y-7-((4+9))=0
We add all the numbers together, and all the variables
4y-7-(13)=0
We add all the numbers together, and all the variables
4y-20=0
We move all terms containing y to the left, all other terms to the right
4y=20
y=20/4
y=5
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