9=7.5x+12

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Solution for 9=7.5x+12 equation: 



9=7.5x+12

We move all terms to the left:

9-(7.5x+12)=0

We get rid of parentheses

-7.5x-12+9=0

We add all the numbers together, and all the variables

-7.5x-3=0

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

-7.5x=3

x=3/-7.5

x=-3/7.5

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