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x in (-oo:+oo)
(-8/5)*x = 40.8 // - 40.8
(-8/5)*x-40.8 = 0
-8/5*x-40.8 = 0 // + 40.8
-8/5*x = 40.8 // : -8/5
x = 40.8/(-8/5)
x = -25.5
x = -25.5
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