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x in (-oo:+oo)
(-5/2)*x-5 = -55 // + 55
(-5/2)*x-5+55 = 0
50-5/2*x = 0 // - 50
-5/2*x = -50 // : -5/2
x = -50/(-5/2)
x = 20
x = 20
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