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(a+20)+(2a)+(a-5)+a=275
We simplify the equation to the form, which is simple to understand
(a+20)+(2a)+(a-5)+a=275
Remove unnecessary parentheses
a+20+(2a)+(a-5)+a=275
Remove unnecessary parentheses
+a+20+2a+(+a-5+)+a=+275
Remove unnecessary parentheses
+a+20+2a+a-5+a=+275
We move all terms containing a to the left and all other terms to the right.
+1a+2a+1a+1a=+275-20+5
We simplify left and right side of the equation.
+5a=+260
We divide both sides of the equation by 5 to get a.
a=52
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