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x in (-oo:+oo)
6-((5/8)*x) = -19 // + 19
6-((5/8)*x)+19 = 0
(-5/8)*x+6+19 = 0
25-5/8*x = 0 // - 25
-5/8*x = -25 // : -5/8
x = -25/(-5/8)
x = 40
x = 40
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