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x in (-oo:+oo)
(-1/5)*x+13 = 9 // - 9
(-1/5)*x-9+13 = 0
4-1/5*x = 0 // - 4
-1/5*x = -4 // : -1/5
x = -4/(-1/5)
x = 20
x = 20
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