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x in (-oo:+oo)
36 = (-9/5)*x // - (-9/5)*x
36-((-9/5)*x) = 0
(9/5)*x+36 = 0
9/5*x+36 = 0 // - 36
9/5*x = -36 // : 9/5
x = -36/9/5
x = -20
x = -20
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