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Y in (-oo:+oo)
3*((85-(3*Y))/3)+3*Y = 85 // - 85
3*((85-(3*Y))/3)+3*Y-85 = 0
3*((85-3*Y)/3)+3*Y-85 = 0
(3*(85-3*Y))/3+3*Y-85 = 0
(3*(85-3*Y))/3+(3*3*Y)/3+(-85*3)/3 = 0
3*(85-3*Y)+3*3*Y-85*3 = 0
255-255 = 0
0 = 0
0/3 = 0
0/3 = 0 // * 3
0 = 0
Y belongs to the empty set
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