5*x+21-9*x=5

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Solution for 5*x+21-9*x=5 equation: 



5x+21-9x=5

We move all terms to the left:

5x+21-9x-(5)=0

We add all the numbers together, and all the variables

-4x+16=0

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

-4x=-16

x=-16/-4

x=+4

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