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-4d-15=-3(d+5)-d
We simplify the equation to the form, which is simple to understand
-4d-15=-3(d+5)-d
Reorder the terms in parentheses
-4d-15=+(-3d-15)-d
Remove unnecessary parentheses
-4d-15=-3d-15-d
We move all terms containing d to the left and all other terms to the right.
-4d+3d+1d=-15+15
We simplify left and right side of the equation.
d=0
0=0
This equation is an identity, so all real numbers are solutions.
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