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