12+15x=-21x-60

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Solution for 12+15x=-21x-60 equation: 



12+15x=-21x-60

We move all terms to the left:

12+15x-(-21x-60)=0

We get rid of parentheses

15x+21x+60+12=0

We add all the numbers together, and all the variables

36x+72=0

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

36x=-72

x=-72/36

x=-2

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