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Ответ: x=34.

Объяснение:

(1/2)*x+(1/17)*x-(1/34)*x=18  |×34

(1/2)*34*x+(1/17)*34*x-(1/34)*34*x=18*34

17x+2x-x=612

18*x=18*34  |÷18

x=34.