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1200+100d=3230+190d
We simplify the equation to the form, which is simple to understand
1200+100d=3230+190d
We move all terms containing d to the left and all other terms to the right.
+100d-190d=+3230-1200
We simplify left and right side of the equation.
-90d=+2030
We divide both sides of the equation by -90 to get d.
d=-22.5555555556
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