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7+4c-9=-6
We simplify the equation to the form, which is simple to understand
7+4c-9=-6
We move all terms containing c to the left and all other terms to the right.
+4c=-6-7+9
We simplify left and right side of the equation.
+4c=-4
We divide both sides of the equation by 4 to get c.
c=-1
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