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x in (-oo:+oo)
(7-4*x)/(-5) = -2 // + 2
(7-4*x)/(-5)+2 = 0
(7-4*x)/(-5)+(-5*2)/(-5) = 0
7-4*x-5*2 = 0
-4*x-3 = 0
(-4*x-3)/(-5) = 0
(-4*x-3)/(-5) = 0 // * -5
-4*x-3 = 0
-4*x-3 = 0 // + 3
-4*x = 3 // : -4
x = 3/(-4)
x = -3/4
x = -3/4
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