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x in (-oo:+oo)
(-4/5)*x-7 = 6 // - 6
(-4/5)*x-7-6 = 0
-4/5*x-13 = 0 // + 13
-4/5*x = 13 // : -4/5
x = 13/(-4/5)
x = -65/4
x = -65/4
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