y+3+y=42

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Solution for y+3+y=42 equation: 



y+3+y=42

We move all terms to the left:

y+3+y-(42)=0

We add all the numbers together, and all the variables

2y-39=0

We move all terms containing y to the left, all other terms to the right

2y=39

y=39/2

y=19+1/2

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