8+4x=9x-12

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Solution for 8+4x=9x-12 equation: 



8+4x=9x-12

We move all terms to the left:

8+4x-(9x-12)=0

We get rid of parentheses

4x-9x+12+8=0

We add all the numbers together, and all the variables

-5x+20=0

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

-5x=-20

x=-20/-5

x=+4

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