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21-7(2x-9+3x)=0
We simplify the equation to the form, which is simple to understand
21-7(2x-9+3x)=0
Reorder the terms in parentheses
21+(+63-35x)=0
Remove unnecessary parentheses
+21+63-35x=0
We move all terms containing x to the left and all other terms to the right.
-35x=0-21-63
We simplify left and right side of the equation.
-35x=-84
We divide both sides of the equation by -35 to get x.
x=2.4
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