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28 = (11/15)*x // - (11/15)*x
28-((11/15)*x) = 0
(-11/15)*x+28 = 0
28-11/15*x = 0 // - 28
-11/15*x = -28 // : -11/15
x = -28/(-11/15)
x = 420/11
x = 420/11
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