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-(x+3)=10
We simplify the equation to the form, which is simple to understand
-(x+3)=10
Remove unnecessary parentheses
-1x-3=10
We move all terms containing x to the left and all other terms to the right.
-1x=+10+3
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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