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x in (-oo:+oo)
(4*x)/3 = 7/15 // - 7/15
(4*x)/3-(7/15) = 0
(4*x)/3-7/15 = 0
4/3*x-7/15 = 0 // + 7/15
4/3*x = 7/15 // : 4/3
x = 7/15/4/3
x = 7/20
x = 7/20
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