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x in (-oo:+oo)
x/4 = 5/12-(x/15)-6 // - 5/12-(x/15)-6
x/4+x/15-(5/12)+6 = 0
x/4+x/15-5/12+6 = 0
19/60*x+67/12 = 0 // - 67/12
19/60*x = -67/12 // : 19/60
x = -67/12/19/60
x = -335/19
x = -335/19
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