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x in (-oo:+oo)
(7/2)*x-19 = 2*x-13 // - 2*x-13
(7/2)*x-(2*x)-19+13 = 0
(7/2)*x-2*x-19+13 = 0
3/2*x-6 = 0 // + 6
3/2*x = 6 // : 3/2
x = 6/3/2
x = 4
x = 4
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