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21x+21=9(1+3x)
We simplify the equation to the form, which is simple to understand
21x+21=9(1+3x)
Reorder the terms in parentheses
21x+21=+(+9+27x)
Remove unnecessary parentheses
+21x+21=+9+27x
We move all terms containing x to the left and all other terms to the right.
+21x-27x=+9-21
We simplify left and right side of the equation.
-6x=-12
We divide both sides of the equation by -6 to get x.
x=2
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