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21x-6=5(4x+3)-9
We simplify the equation to the form, which is simple to understand
21x-6=5(4x+3)-9
Reorder the terms in parentheses
21x-6=+(+20x+15)-9
Remove unnecessary parentheses
+21x-6=+20x+15-9
We move all terms containing x to the left and all other terms to the right.
+21x-20x=+15-9+6
We simplify left and right side of the equation.
+1x=+12
We divide both sides of the equation by 1 to get x.
x=12
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