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x in (-oo:+oo)
28 = (4/9)*x // - (4/9)*x
28-((4/9)*x) = 0
(-4/9)*x+28 = 0
28-4/9*x = 0 // - 28
-4/9*x = -28 // : -4/9
x = -28/(-4/9)
x = 63
x = 63
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