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3(2a-10)+9(2-5a)=66
We simplify the equation to the form, which is simple to understand
3(2a-10)+9(2-5a)=66
Reorder the terms in parentheses
+(+6a-30)+9*(2-5a)=66
Remove unnecessary parentheses
+6a-30+9+*(+2-5a+)=+66
Reorder the terms in parentheses
+6a-30+(+18-45a)=66
Remove unnecessary parentheses
+6a-30+18-45a=+66
We move all terms containing a to the left and all other terms to the right.
+6a-45a=+66+30-18
We simplify left and right side of the equation.
-39a=+78
We divide both sides of the equation by -39 to get a.
a=-2
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