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d+(-13)=-879
We simplify the equation to the form, which is simple to understand
d+(-13)=-879
Remove unnecessary parentheses
+d-13=-879
We move all terms containing d to the left and all other terms to the right.
+1d=-879+13
We simplify left and right side of the equation.
+1d=-866
We divide both sides of the equation by 1 to get d.
d=-866
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