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