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x in (-oo:+oo)
3/4 = (3/8)*x-(3/8) // - (3/8)*x-(3/8)
3/4-((3/8)*x)+3/8 = 0
(-3/8)*x+3/4+3/8 = 0
9/8-3/8*x = 0 // - 9/8
-3/8*x = -9/8 // : -3/8
x = -9/8/(-3/8)
x = 3
x = 3
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