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4a+20=6(a+2)-3(a-5)
We simplify the equation to the form, which is simple to understand
4a+20=6(a+2)-3(a-5)
Reorder the terms in parentheses
4a+20=+(+6a+12)-3*(a-5)
Remove unnecessary parentheses
+4a+20=+6a+12-3+*(+a-5+)
Reorder the terms in parentheses
4a+20=+6a+12+(-3a+15)
Remove unnecessary parentheses
+4a+20=+6a+12-3a+15
We move all terms containing a to the left and all other terms to the right.
+4a-6a+3a=+12+15-20
We simplify left and right side of the equation.
+1a=+7
We divide both sides of the equation by 1 to get a.
a=7
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