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49=4-9y
We move all terms to the left:
49-(4-9y)=0
We add all the numbers together, and all the variables
-(-9y+4)+49=0
We get rid of parentheses
9y-4+49=0
We add all the numbers together, and all the variables
9y+45=0
We move all terms containing y to the left, all other terms to the right
9y=-45
y=-45/9
y=-5
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