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d+2/5=7/10
We simplify the equation to the form, which is simple to understand
d+2/5=7/10
We move all terms containing d to the left and all other terms to the right.
+1d=0.7-0.4
We simplify left and right side of the equation.
+1d=0.3
We divide both sides of the equation by 1 to get d.
d=0.3
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