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30+15y=40+14y
We move all terms to the left:
30+15y-(40+14y)=0
We add all the numbers together, and all the variables
15y-(14y+40)+30=0
We get rid of parentheses
15y-14y-40+30=0
We add all the numbers together, and all the variables
y-10=0
We move all terms containing y to the left, all other terms to the right
y=10
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