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3(x+5)-9=21
We simplify the equation to the form, which is simple to understand
3(x+5)-9=21
Reorder the terms in parentheses
+(+3x+15)-9=21
Remove unnecessary parentheses
+3x+15-9=+21
We move all terms containing x to the left and all other terms to the right.
+3x=+21-15+9
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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