x.2x+8=21

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Solution for x.2x+8=21 equation: 



x.2x+8=21

We move all terms to the left:

x.2x+8-(21)=0

We add all the numbers together, and all the variables

x.2x-13=0

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

x.2x=13

x=13/1

x=13

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