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3*x-12 = y*((11*x-1)/2) // - y*((11*x-1)/2)
3*x-(y*((11*x-1)/2))-12 = 0
(-1*y*(11*x-1))/2+3*x-12 = 0
(-1*y*(11*x-1))/2+(2*3*x)/2+(-12*2)/2 = 0
2*3*x-1*y*(11*x-1)-12*2 = 0
6*x-11*x*y+y-24 = 0
(6*x-11*x*y+y-24)/2 = 0
(6*x-11*x*y+y-24)/2 = 0 // * 2
6*x-11*x*y+y-24 = 0
6*x+y-24 = 0 // - y-24
6*x = -(y-24) // : 6
x = (-(y-24))/6
x = (24-y)/6
x = (24-y)/6
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