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28 = (2/5)*x // - (2/5)*x
28-((2/5)*x) = 0
(-2/5)*x+28 = 0
28-2/5*x = 0 // - 28
-2/5*x = -28 // : -2/5
x = -28/(-2/5)
x = 70
x = 70
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