+2x+7=21

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Solution for +2x+7=21 equation: 



+2x+7=21

We move all terms to the left:

+2x+7-(21)=0

We add all the numbers together, and all the variables

2x-14=0

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

2x=14

x=14/2

x=7

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