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-3(a+2)+7(-2a-1)=6a-6(3a+5)
We simplify the equation to the form, which is simple to understand
-3(a+2)+7(-2a-1)=6a-6(3a+5)
Reorder the terms in parentheses
+(-3a-6)+7*(-2a-1)=6a-6*(3a+5)
Remove unnecessary parentheses
-3a-6+7+*(-2a-1+)=+6a-6+*(+3a+5+)
Reorder the terms in parentheses
-3a-6+(-14a-7)=6a-6*(3a+5)
Remove unnecessary parentheses
-3a-6-14a-7=+6a-6+*(+3a+5+)
Reorder the terms in parentheses
-3a-6-14a-7=6a+(-18a-30)
Remove unnecessary parentheses
-3a-6-14a-7=+6a-18a-30
We move all terms containing a to the left and all other terms to the right.
-3a-14a-6a+18a=-30+6+7
We simplify left and right side of the equation.
-5a=-17
We divide both sides of the equation by -5 to get a.
a=3.4
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