Unknown number 5

I think of an unknown number. If we enlarge it five times then subtract 3 and the result decreases by 75% we get one greater than the number. What number am I thinking of?

Correct result:

x =  7


(5x-3)•(1-75/100) = 1+x

(5•x-3)•(1-75/100) = 1+x

25x = 175

x = 7

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