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3(4c-7)+6=21
We simplify the equation to the form, which is simple to understand
3(4c-7)+6=21
Reorder the terms in parentheses
+(+12c-21)+6=21
Remove unnecessary parentheses
+12c-21+6=+21
We move all terms containing c to the left and all other terms to the right.
+12c=+21+21-6
We simplify left and right side of the equation.
+12c=+36
We divide both sides of the equation by 12 to get c.
c=3
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