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(4*x)/15-(6*x)-(28/5) = 0
(4*x)/15-6*x-28/5 = 0
-86/15*x-28/5 = 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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