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x in (-oo:+oo)
(13/3)*x+3/7 = (4/3)*x // - (4/3)*x
(13/3)*x-((4/3)*x)+3/7 = 0
(13/3)*x+(-4/3)*x+3/7 = 0
3*x+3/7 = 0 // - 3/7
3*x = -3/7 // : 3
x = -3/7/3
x = -1/7
x = -1/7
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