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x in (-oo:+oo)
-10 = (5/4)*x+10 // - (5/4)*x+10
-((5/4)*x)-10-10 = 0
(-5/4)*x-10-10 = 0
-5/4*x-20 = 0 // + 20
-5/4*x = 20 // : -5/4
x = 20/(-5/4)
x = -16
x = -16
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