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x in (-oo:+oo)
x/(-13) = 0.7 // - 0.7
x/(-13)-0.7 = 0
-1/13*x-0.7 = 0 // + 0.7
-1/13*x = 0.7 // : -1/13
x = 0.7/(-1/13)
x = -9.09999964
x = -9.09999964
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