2.5x+7=21

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Solution for 2.5x+7=21 equation: 



2.5x+7=21

We move all terms to the left:

2.5x+7-(21)=0

We add all the numbers together, and all the variables

2.5x-14=0

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

2.5x=14

x=14/2.5

x=5+1/1.6666666666667

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