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x in (-oo:+oo)
(1/2)*x-((4/5)*x) = 10-19 // - 10-19
(1/2)*x-((4/5)*x)-10+19 = 0
(1/2)*x+(-4/5)*x-10+19 = 0
9-3/10*x = 0 // - 9
-3/10*x = -9 // : -3/10
x = -9/(-3/10)
x = 30
x = 30
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