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x in (-oo:+oo)
(-5*x)/4 = 7/2 // - 7/2
(-5*x)/4-(7/2) = 0
(-5*x)/4-7/2 = 0
-5/4*x-7/2 = 0 // + 7/2
-5/4*x = 7/2 // : -5/4
x = 7/2/(-5/4)
x = -14/5
x = -14/5
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