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x in (-oo:+oo)
x/5 = -1.3 // + 1.3
x/5+1.3 = 0
1/5*x+1.3 = 0 // - 1.3
1/5*x = -1.3 // : 1/5
x = -1.3/1/5
x = -6.5
x = -6.5
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