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x in (-oo:+oo)
(-13/15)*x = 7 // - 7
(-13/15)*x-7 = 0
-13/15*x-7 = 0 // + 7
-13/15*x = 7 // : -13/15
x = 7/(-13/15)
x = -105/13
x = -105/13
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