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x-(-9)=39
We simplify the equation to the form, which is simple to understand
x-(-9)=39
Remove unnecessary parentheses
x+9=39
We move all terms containing x to the left and all other terms to the right.
+1x=+39-9
We simplify left and right side of the equation.
+1x=+30
We divide both sides of the equation by 1 to get x.
x=30
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