(5+a)15=-75

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Solution for (5+a)15=-75 equation: 



(5+a)15=-75

We move all terms to the left:

(5+a)15-(-75)=0

We add all the numbers together, and all the variables

(a+5)15-(-75)=0

We add all the numbers together, and all the variables

(a+5)15+75=0

We multiply parentheses

15a+75+75=0

We add all the numbers together, and all the variables

15a+150=0

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

15a=-150

a=-150/15

a=-10

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