8x*2-9x-21=0

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Solution for 8x*2-9x-21=0 equation: 



8x*2-9x-21=0

We add all the numbers together, and all the variables

-9x+8x*2-21=0

Wy multiply elements

-9x+16x-21=0

We add all the numbers together, and all the variables

7x-21=0

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

7x=21

x=21/7

x=3

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