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x in (-oo:+oo)
28 = (4/5)*x // - (4/5)*x
28-((4/5)*x) = 0
(-4/5)*x+28 = 0
28-4/5*x = 0 // - 28
-4/5*x = -28 // : -4/5
x = -28/(-4/5)
x = 35
x = 35
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