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2(a+2)+3a=13-(20+2)
We simplify the equation to the form, which is simple to understand
2(a+2)+3a=13-(20+2)
Simplifying terms in parentheses
2*(a+2)+3a=13-(+22)
Reorder the terms in parentheses
+(+2a+4)+3a=13-(+22)
Remove unnecessary parentheses
+2a+4+3a=+13-(+22+)
Remove unnecessary parentheses
+2a+4+3a=13-22
We move all terms containing a to the left and all other terms to the right.
+2a+3a=+13-22-4
We simplify left and right side of the equation.
+5a=-13
We divide both sides of the equation by 5 to get a.
a=-2.6
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