10x+9=9*10+21

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Solution for 10x+9=9*10+21 equation: 



10x+9=9*10+21

We move all terms to the left:

10x+9-(9*10+21)=0

We add all the numbers together, and all the variables

10x+9-111=0

We add all the numbers together, and all the variables

10x-102=0

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

10x=102

x=102/10

x=10+1/5

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