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x in (-oo:+oo)
(4/5)*x-((1/3)*x) = 14 // - 14
(4/5)*x-((1/3)*x)-14 = 0
(4/5)*x+(-1/3)*x-14 = 0
7/15*x-14 = 0 // + 14
7/15*x = 14 // : 7/15
x = 14/7/15
x = 30
x = 30
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