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x in (-oo:+oo)
-4*x-(-5/(-7)) = 13 // - 13
-4*x-(-5/(-7))-13 = 0
-4*x-5/7-13 = 0
-4*x-96/7 = 0 // + 96/7
-4*x = 96/7 // : -4
x = 96/7/(-4)
x = -24/7
x = -24/7
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