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x in (-oo:+oo)
4*x+19 = (5/6)*x // - (5/6)*x
4*x-((5/6)*x)+19 = 0
4*x+(-5/6)*x+19 = 0
19/6*x+19 = 0 // - 19
19/6*x = -19 // : 19/6
x = -19/19/6
x = -6
x = -6
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