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x in (-oo:+oo)
36/9 = 5*x-7*2*x // - 5*x-7*2*x
36/9-(5*x)-(-7*2*x) = 0
14*x-5*x+36/9 = 0
9*x+4 = 0 // - 4
9*x = -4 // : 9
x = -4/9
x = -4/9
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