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