10x-9=4x+21

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Solution for 10x-9=4x+21 equation: 



10x-9=4x+21

We move all terms to the left:

10x-9-(4x+21)=0

We get rid of parentheses

10x-4x-21-9=0

We add all the numbers together, and all the variables

6x-30=0

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

6x=30

x=30/6

x=5

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