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Solve for x:
(17 x)/12 = 51

Multiply both sides of (17 x)/12 = 51 by 12/17:
((12×17 x)/(17))/(12) = 12/17×51

12/17×51 = (12×51)/17:
(12×17 x)/(17×12) = (12×51)/17

(12×17 x)/(17×12) = (17×12)/(17×12)×x = x:
x = (12×51)/17

51/17 = (17×3)/17 = 3:
x = 12×3

12×3  =  36:
Answer: | 
| x = 36

(3x/4) + (2x/3)=51

9x/12 + 8x/12=51

17x/12=51 cross multiply

17x=612 divide both sides by 17

x=612/17

x=36