Question

I think of a number I doubble it, substact
the result from 7 and multiply the result by 3
My answer is the number I first thought of
What number did I think off​

Answer 1

Let the no. be x

Now,

x^2-7*3

x^2=21

x=21/2

x=10.5

Answer 2

Let's

The number be x

According to given condition :

x*2-7*3=0

x*2=21

x=21/2

x=10.5

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