7n-(3n-5)=21

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Solution for 7n-(3n-5)=21 equation:


7n-(3n-5)=21

We simplify the equation to the form, which is simple to understand 
7n-(3n-5)=21

Remove unnecessary parentheses
7n-3n+5=21

We move all terms containing n to the left and all other terms to the right. 
+7n-3n=+21-5

We simplify left and right side of the equation. 
+4n=+16

We divide both sides of the equation by 4 to get n. 
n=4

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