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-x+(-4)=-7
We simplify the equation to the form, which is simple to understand
-x+(-4)=-7
Remove unnecessary parentheses
-x-4=-7
We move all terms containing x to the left and all other terms to the right.
-1x=-7+4
We simplify left and right side of the equation.
-1x=-3
We divide both sides of the equation by -1 to get x.
x=3
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