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(7-c)(-1)=0
We simplify the equation to the form, which is simple to understand
(7-c)*(-1)=0
Reorder the terms in parentheses
multiplication of parentheses
(-7+1c)=0
Remove unnecessary parentheses
-7+1c=0
We move all terms containing c to the left and all other terms to the right.
+1c=0+7
We simplify left and right side of the equation.
+1c=+7
We divide both sides of the equation by 1 to get c.
c=7
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