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d+3.95+.25d=7.7
We simplify the equation to the form, which is simple to understand
d+3.95+.25d=7.7
We move all terms containing d to the left and all other terms to the right.
+1d + 0.25d=+7.7-3.95
We simplify left and right side of the equation.
+1.25d=+3.75
We divide both sides of the equation by 1.25 to get d.
d=3
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