y+7=21-7

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Solution for y+7=21-7 equation: 



y+7=21-7

We move all terms to the left:

y+7-(21-7)=0

We add all the numbers together, and all the variables

y+7-14=0

We add all the numbers together, and all the variables

y-7=0

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

y=7

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