-5(4+5a)=105

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Solution for -5(4+5a)=105 equation: 



-5(4+5a)=105

We move all terms to the left:

-5(4+5a)-(105)=0

We add all the numbers together, and all the variables

-5(5a+4)-105=0

We multiply parentheses

-25a-20-105=0

We add all the numbers together, and all the variables

-25a-125=0

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

-25a=125

a=125/-25

a=-5

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