(d+9)10=210

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Solution for (d+9)10=210 equation:



(d+9)10=210
We move all terms to the left:
(d+9)10-(210)=0
We multiply parentheses
10d+90-210=0
We add all the numbers together, and all the variables
10d-120=0
We move all terms containing d to the left, all other terms to the right
10d=120
d=120/10
d=12

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