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x in (-oo:+oo)
x/4 = 3/5 // - 3/5
x/4-(3/5) = 0
x/4-3/5 = 0
1/4*x-3/5 = 0 // + 3/5
1/4*x = 3/5 // : 1/4
x = 3/5/1/4
x = 12/5
x = 12/5
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