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x in (-oo:+oo)
4/3-(x/7) = 1/5 // - 1/5
4/3-(x/7)-(1/5) = 0
4/3-(x/7)-1/5 = 0
17/15-1/7*x = 0 // - 17/15
-1/7*x = -17/15 // : -1/7
x = -17/15/(-1/7)
x = 119/15
x = 119/15
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