2(2x+1)-(x-4)=21

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Solution for 2(2x+1)-(x-4)=21 equation:


2(2x+1)-(x-4)=21

We simplify the equation to the form, which is simple to understand 
2(2x+1)-(x-4)=21

Reorder the terms in parentheses
+(+4x+2)-(x-4)=21

Remove unnecessary parentheses
+4x+2-(+x-4+)=+21

Remove unnecessary parentheses
+4x+2-1x+4=21

We move all terms containing x to the left and all other terms to the right. 
+4x-1x=+21-2-4

We simplify left and right side of the equation. 
+3x=+15

We divide both sides of the equation by 3 to get x. 
x=5

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