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(4*x)/15-(6*x)+28/5 = 0
(4*x)/15-6*x+28/5 = 0
28/5-86/15*x = 0 // - 28/5
-86/15*x = -28/5 // : -86/15
x = -28/5/(-86/15)
x = 42/43
x = 42/43
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