8+9x=21x-40

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Solution for 8+9x=21x-40 equation: 



8+9x=21x-40

We move all terms to the left:

8+9x-(21x-40)=0

We get rid of parentheses

9x-21x+40+8=0

We add all the numbers together, and all the variables

-12x+48=0

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

-12x=-48

x=-48/-12

x=+4

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