12+15t=-20+2+9t

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Solution for 12+15t=-20+2+9t equation: 



12+15t=-20+2+9t

We move all terms to the left:

12+15t-(-20+2+9t)=0

We add all the numbers together, and all the variables

15t-(9t-18)+12=0

We get rid of parentheses

15t-9t+18+12=0

We add all the numbers together, and all the variables

6t+30=0

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

6t=-30

t=-30/6

t=-5

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