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67=-1-4(-1+4a)
We simplify the equation to the form, which is simple to understand
67=-1-4(-1+4a)
Reorder the terms in parentheses
67=-1+(+4-16a)
Remove unnecessary parentheses
+67=-1+4-16a
We move all terms containing a to the left and all other terms to the right.
+16a=-1+4-67
We simplify left and right side of the equation.
+16a=-64
We divide both sides of the equation by 016 to get a.
a=-4
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