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x in (-oo:+oo)
(3*x)/4 = 30/5 // - 30/5
(3*x)/4-(30/5) = 0
(3*x)/4-6 = 0
3/4*x-6 = 0 // + 6
3/4*x = 6 // : 3/4
x = 6/3/4
x = 8
x = 8
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