x*2+8=21

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Solution for x*2+8=21 equation: 



x*2+8=21

We move all terms to the left:

x*2+8-(21)=0

We add all the numbers together, and all the variables

x*2-13=0

Wy multiply elements

2x-13=0

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

2x=13

x=13/2

x=6+1/2

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