You can put this solution on YOUR website! x is being multiplied by 3/4, the opposite of multiplying is dividing. When we divide by a fraction we multiply by the reciprocal (a fancy word meaning the fraction upside down).
(3/4)x=6
(4/3)*(3/4)x=6*(4/3)
(4*3)/(3*4)x=(6*4)/3
(12/12)x=24/3
x=8