21n-45=144

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Solution for 21n-45=144 equation: 



21n-45=144

We move all terms to the left:

21n-45-(144)=0

We add all the numbers together, and all the variables

21n-189=0

We move all terms containing n to the left, all other terms to the right

21n=189

n=189/21

n=9

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