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21=3x+6(x-4)
We simplify the equation to the form, which is simple to understand
21=3x+6(x-4)
Reorder the terms in parentheses
21=3x+(+6x-24)
Remove unnecessary parentheses
+21=+3x+6x-24
We move all terms containing x to the left and all other terms to the right.
-3x-6x=-24-21
We simplify left and right side of the equation.
-9x=-45
We divide both sides of the equation by -9 to get x.
x=5
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