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x in (-oo:+oo)
(-7/13)*x = -6 // + 6
(-7/13)*x+6 = 0
6-7/13*x = 0 // - 6
-7/13*x = -6 // : -7/13
x = -6/(-7/13)
x = 78/7
x = 78/7
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