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`8-5(2a+3)=0`

We simplify the equation to the form, which is simple to understand

8-5(2a+3)=0

Reorder the terms in parentheses

8+(-10a-15)=0

Remove unnecessary parentheses

+8-10a-15=0

We move all terms containing a to the left and all other terms to the right.

-10a=0-8+15

We simplify left and right side of the equation.

-10a=+7

We divide both sides of the equation by -10 to get a.

a=-0.7

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