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5(-3x-8)=50

We move all terms to the left:

5(-3x-8)-(50)=0

We multiply parentheses

-15x-40-50=0

We add all the numbers together, and all the variables

-15x-90=0

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

-15x=90

x=90/-15

x=-6

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