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x in (-oo:+oo)
x+3 = (-10/3)*x // - (-10/3)*x
x-((-10/3)*x)+3 = 0
x+(10/3)*x+3 = 0
13/3*x+3 = 0 // - 3
13/3*x = -3 // : 13/3
x = -3/13/3
x = -9/13
x = -9/13
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