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x in (-oo:+oo)
x/65 = -10/13 // + -10/13
x/65-(-10/13) = 0
x/65+10/13 = 0
1/65*x+10/13 = 0 // - 10/13
1/65*x = -10/13 // : 1/65
x = -10/13/1/65
x = -50
x = -50
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