21x-4x=90

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Solution for 21x-4x=90 equation: 



21x-4x=90

We move all terms to the left:

21x-4x-(90)=0

We add all the numbers together, and all the variables

17x-90=0

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

17x=90

x=90/17

x=5+5/17

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