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5a+10(a+3)+25(a+2)=520
We simplify the equation to the form, which is simple to understand
5a+10(a+3)+25(a+2)=520
Reorder the terms in parentheses
5a+(+10a+30)+25*(a+2)=520
Remove unnecessary parentheses
+5a+10a+30+25+*(+a+2+)=+520
Reorder the terms in parentheses
5a+10a+30+(+25a+50)=520
Remove unnecessary parentheses
+5a+10a+30+25a+50=+520
We move all terms containing a to the left and all other terms to the right.
+5a+10a+25a=+520-30-50
We simplify left and right side of the equation.
+40a=+440
We divide both sides of the equation by 40 to get a.
a=11
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