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a=2(4)+5(a-4)
We simplify the equation to the form, which is simple to understand
a=2(4)+5(a-4)
Reorder the terms in parentheses
a=+(+8)+5*(a-4)
Remove unnecessary parentheses
+a=+8+5+*(+a-4+)
Reorder the terms in parentheses
a=+8+(+5a-20)
Remove unnecessary parentheses
+a=+8+5a-20
We move all terms containing a to the left and all other terms to the right.
+1a-5a=+8-20
We simplify left and right side of the equation.
-4a=-12
We divide both sides of the equation by -4 to get a.
a=3
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