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x in (-oo:+oo)
(-5/2)*x+1 = 7/2 // - 7/2
(-5/2)*x-(7/2)+1 = 0
(-5/2)*x-7/2+1 = 0
-5/2*x-5/2 = 0 // + 5/2
-5/2*x = 5/2 // : -5/2
x = 5/2/(-5/2)
x = -1
x = -1
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