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4+8+9(3a+5)+8(2+1)=0
We simplify the equation to the form, which is simple to understand
4+8+9(3a+5)+8(2+1)=0
Reorder the terms in parentheses
4+8+(+27a+45)+8*(+3)=0
Remove unnecessary parentheses
+4+8+27a+45+8+*(+3+)=0
Reorder the terms in parentheses
4+8+27a+45+(+24)=0
Remove unnecessary parentheses
+4+8+27a+45+24=0
We move all terms containing a to the left and all other terms to the right.
+27a=0-4-8-45-24
We simplify left and right side of the equation.
+27a=-81
We divide both sides of the equation by 27 to get a.
a=-3
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