15-3(2x+4)=21

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Solution for 15-3(2x+4)=21 equation:


15-3(2x+4)=21

We simplify the equation to the form, which is simple to understand 
15-3(2x+4)=21

Reorder the terms in parentheses
15+(-6x-12)=21

Remove unnecessary parentheses
+15-6x-12=+21

We move all terms containing x to the left and all other terms to the right. 
-6x=+21-15+12

We simplify left and right side of the equation. 
-6x=+18

We divide both sides of the equation by -6 to get x. 
x=-3

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