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x in (-oo:+oo)
x/5-(x/8) = 3/4 // - 3/4
x/5-(x/8)-(3/4) = 0
x/5-(x/8)-3/4 = 0
3/40*x-3/4 = 0 // + 3/4
3/40*x = 3/4 // : 3/40
x = 3/4/3/40
x = 10
x = 10
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