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x in (-oo:+oo)
(5/4)*x+5/6 = (7/6)*x // - (7/6)*x
(5/4)*x-((7/6)*x)+5/6 = 0
(5/4)*x+(-7/6)*x+5/6 = 0
1/12*x+5/6 = 0 // - 5/6
1/12*x = -5/6 // : 1/12
x = -5/6/1/12
x = -10
x = -10
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