3.5+2x=21.5

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Solution for 3.5+2x=21.5 equation: 



3.5+2x=21.5

We move all terms to the left:

3.5+2x-(21.5)=0

We add all the numbers together, and all the variables

2x-18=0

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

2x=18

x=18/2

x=9

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