30x-21=99

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Solution for 30x-21=99 equation: 



30x-21=99

We move all terms to the left:

30x-21-(99)=0

We add all the numbers together, and all the variables

30x-120=0

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

30x=120

x=120/30

x=4

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