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-(4-x)=9
We simplify the equation to the form, which is simple to understand
-(4-x)=9
Remove unnecessary parentheses
-4+1x=9
We move all terms containing x to the left and all other terms to the right.
+1x=+9+4
We simplify left and right side of the equation.
+1x=+13
We divide both sides of the equation by 1 to get x.
x=13
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