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x in (-oo:+oo)
4 = (3/4)*x // - (3/4)*x
4-((3/4)*x) = 0
(-3/4)*x+4 = 0
4-3/4*x = 0 // - 4
-3/4*x = -4 // : -3/4
x = -4/(-3/4)
x = 16/3
x = 16/3
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