(d-11)*9=90

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Solution for (d-11)*9=90 equation:



(d-11)*9=90
We move all terms to the left:
(d-11)*9-(90)=0
We multiply parentheses
9d-99-90=0
We add all the numbers together, and all the variables
9d-189=0
We move all terms containing d to the left, all other terms to the right
9d=189
d=189/9
d=21

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