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x in (-oo:+oo)
(3/5)*x+13 = 12 // - 12
(3/5)*x-12+13 = 0
3/5*x+1 = 0 // - 1
3/5*x = -1 // : 3/5
x = -1/3/5
x = -5/3
x = -5/3
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