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a+5+2=5(2a+1)-7(a-4)
We simplify the equation to the form, which is simple to understand
a+5+2=5(2a+1)-7(a-4)
Reorder the terms in parentheses
a+5+2=+(+10a+5)-7*(a-4)
Remove unnecessary parentheses
+a+5+2=+10a+5-7+*(+a-4+)
Reorder the terms in parentheses
a+5+2=+10a+5+(-7a+28)
Remove unnecessary parentheses
+a+5+2=+10a+5-7a+28
We move all terms containing a to the left and all other terms to the right.
+1a-10a+7a=+5+28-5-2
We simplify left and right side of the equation.
-2a=+26
We divide both sides of the equation by -2 to get a.
a=-13
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