-12x=9(x+2.13)

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Solution for -12x=9(x+2.13) equation: 



-12x=9(x+2.13)

We move all terms to the left:

-12x-(9(x+2.13))=0



We calculate terms in parentheses: -(9(x+2.13)), so:

9(x+2.13)

We multiply parentheses

9x+19.17

Back to the equation:

-(9x+19.17)



We get rid of parentheses

-12x-9x-19.17=0

We add all the numbers together, and all the variables

-21x-19.17=0

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

-21x=19.17

x=19.17/-21

x=-16.384615384615/17.948717948718

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