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-6(1-7a)=-300
We simplify the equation to the form, which is simple to understand
-6(1-7a)=-300
Reorder the terms in parentheses
+(-6+42a)=-300
Remove unnecessary parentheses
-6+42a=-300
We move all terms containing a to the left and all other terms to the right.
+42a=-300+6
We simplify left and right side of the equation.
+42a=-294
We divide both sides of the equation by 42 to get a.
a=-7
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