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x in (-oo:+oo)
111-x = (3/4)*(x-27) // - (3/4)*(x-27)
111-((3/4)*(x-27))-x = 0
(-3/4)*(x-27)-x+111 = 0
111-3/4*(x-27)-x = 0
111-3/4*(x-27)-x = 0
81/4-7/4*x+111 = 0
525/4-7/4*x = 0
525/4-7/4*x = 0
525/4-7/4*x = 0 // - 525/4
-7/4*x = -525/4 // : -7/4
x = -525/4/(-7/4)
x = 75
x = 75
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