21=3(2+3x)-4x

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


21=3(2+3x)-4x

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

Reorder the terms in parentheses
21=+(+6+9x)-4x

Remove unnecessary parentheses
+21=+6+9x-4x

We move all terms containing x to the left and all other terms to the right. 
-9x+4x=+6-21

We simplify left and right side of the equation. 
-5x=-15

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

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