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x in (-oo:+oo)
x/(-5) = -2.6 // + 2.6
x/(-5)+2.6 = 0
2.6-1/5*x = 0 // - 2.6
-1/5*x = -2.6 // : -1/5
x = -2.6/(-1/5)
x = 13
x = 13
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