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2d+6=5.55
We simplify the equation to the form, which is simple to understand
2d+6=5.55
We move all terms containing d to the left and all other terms to the right.
+2d=+5.55-6
We simplify left and right side of the equation.
+2d=-0.45
We divide both sides of the equation by 2 to get d.
d=-0.225
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