6x+21+51=90

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Solution for 6x+21+51=90 equation: 



6x+21+51=90

We move all terms to the left:

6x+21+51-(90)=0

We add all the numbers together, and all the variables

6x-18=0

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

6x=18

x=18/6

x=3

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