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9(a-7)=-6(-a-1)
We simplify the equation to the form, which is simple to understand
9(a-7)=-6(-a-1)
Reorder the terms in parentheses
+(+9a-63)=-6*(-a-1)
Remove unnecessary parentheses
+9a-63=-6+*(-a-1+)
Reorder the terms in parentheses
+9a-63=+(+6a+6)
Remove unnecessary parentheses
+9a-63=+6a+6
We move all terms containing a to the left and all other terms to the right.
+9a-6a=+6+63
We simplify left and right side of the equation.
+3a=+69
We divide both sides of the equation by 3 to get a.
a=23
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