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x in (-oo:+oo)
(-5/2)*x = 7/4 // - 7/4
(-5/2)*x-(7/4) = 0
(-5/2)*x-7/4 = 0
-5/2*x-7/4 = 0 // + 7/4
-5/2*x = 7/4 // : -5/2
x = 7/4/(-5/2)
x = -7/10
x = -7/10
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