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x-17= 3x - x
5 6
x-17=6(3x)-5(x)
(5)(6)
x-17=18x-5x
30
x-17= 13x
30
30(x-17)=13x
30x-510=13x
30x-13x=510
17x=510
x=510/17
x=30
el numero es el 30