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10d+7+4d=50
We simplify the equation to the form, which is simple to understand
10d+7+4d=50
We move all terms containing d to the left and all other terms to the right.
+10d+4d=+50-7
We simplify left and right side of the equation.
+14d=+43
We divide both sides of the equation by 14 to get d.
d=3.07142857143
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