/6*x+1/3*x+1/3*3=75*1/6

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/6*x+1/3*x+1/3*3=75*1/6/6*x+1/3*x+1/3*3=75*1/6/6*x+1/3*x+1/3*3=75*1/61/6x+1/3x+1/3*3=75*1/6(1/6+1/3)

/6*x+1/3*x+1/3*3=75*1/6
/6*x+1/3*x+1/3*3=75*1/6

/6*x+1/3*x+1/3*3=75*1/6
1/6 x +1/3 x +1/3 * 3 =75 *1/6
(1/6+1/3)x =75*1/6 - 1
1/2x= 25/2 -1
x=25/2 *2 -2=25-2=23
即x=23