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x in (-oo:+oo)
19-((3/4)*x) = 16 // - 16
19-((3/4)*x)-16 = 0
(-3/4)*x-16+19 = 0
3-3/4*x = 0 // - 3
-3/4*x = -3 // : -3/4
x = -3/(-3/4)
x = 4
x = 4
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