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d-(-4)=25
We simplify the equation to the form, which is simple to understand
d-(-4)=25
Remove unnecessary parentheses
d+4=25
We move all terms containing d to the left and all other terms to the right.
+1d=+25-4
We simplify left and right side of the equation.
+1d=+21
We divide both sides of the equation by 1 to get d.
d=21
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