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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.
+290d=+2030
We divide both sides of the equation by 290 to get d.
d=7
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