15a+66=-5a-54

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Solution for 15a+66=-5a-54 equation: 



15a+66=-5a-54

We move all terms to the left:

15a+66-(-5a-54)=0

We get rid of parentheses

15a+5a+54+66=0

We add all the numbers together, and all the variables

20a+120=0

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

20a=-120

a=-120/20

a=-6

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