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1.50d-30=12
We simplify the equation to the form, which is simple to understand
1.50d-30=12
We move all terms containing d to the left and all other terms to the right.
+1.5d=+12+30
We simplify left and right side of the equation.
+1.5d=+42
We divide both sides of the equation by 1.5 to get d.
d=28
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