8+12x=21x-1

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Solution for 8+12x=21x-1 equation: 



8+12x=21x-1

We move all terms to the left:

8+12x-(21x-1)=0

We get rid of parentheses

12x-21x+1+8=0

We add all the numbers together, and all the variables

-9x+9=0

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

-9x=-9

x=-9/-9

x=1

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