[3x+7]=7x-21

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Solution for [3x+7]=7x-21 equation:


[3x+7]=7x-21

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

Remove unnecessary parentheses
3x+7=7x-21

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

We simplify left and right side of the equation. 
-4x=-28

We divide both sides of the equation by -4 to get x. 
x=7

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