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-28+42y=-49-35y
We move all terms to the left:
-28+42y-(-49-35y)=0
We add all the numbers together, and all the variables
42y-(-35y-49)-28=0
We get rid of parentheses
42y+35y+49-28=0
We add all the numbers together, and all the variables
77y+21=0
We move all terms containing y to the left, all other terms to the right
77y=-21
y=-21/77
y=-3/11
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