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21x-9(4)=-15
We simplify the equation to the form, which is simple to understand
21x-9(4)=-15
Reorder the terms in parentheses
21x+(-36)=-15
Remove unnecessary parentheses
+21x-36=-15
We move all terms containing x to the left and all other terms to the right.
+21x=-15+36
We simplify left and right side of the equation.
+21x=+21
We divide both sides of the equation by 21 to get x.
x=1
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