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10*9+d=210
We simplify the equation to the form, which is simple to understand
10*9+d=210
We move all terms containing d to the left and all other terms to the right.
+1d=+210-90
We simplify left and right side of the equation.
+1d=+120
We divide both sides of the equation by 1 to get d.
d=120
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