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8d-(-3d)-(-5d)+(-19d)+12d=-9
We simplify the equation to the form, which is simple to understand
8d-(-3d)-(-5d)+(-19d)+12d=-9
Remove unnecessary parentheses
8d+3d-(-5d)+(-19d)+12d=-9
Remove unnecessary parentheses
8d+3d+5d+(-19d)+12d=-9
Remove unnecessary parentheses
+8d+3d+5d-19d+12d=-9
We move all terms containing d to the left and all other terms to the right.
+8d+3d+5d-19d+12d=-9
We simplify left and right side of the equation.
+9d=-9
We divide both sides of the equation by 9 to get d.
d=-1
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