2x+21-8=9

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Solution for 2x+21-8=9 equation: 



2x+21-8=9

We move all terms to the left:

2x+21-8-(9)=0

We add all the numbers together, and all the variables

2x+4=0

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

2x=-4

x=-4/2

x=-2

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