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28-((2/5)*x) = 34 // - 34
28-((2/5)*x)-34 = 0
(-2/5)*x-34+28 = 0
-2/5*x-6 = 0 // + 6
-2/5*x = 6 // : -2/5
x = 6/(-2/5)
x = -15
x = -15
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