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x in (-oo:+oo)
x/7 = 2/8 // - 2/8
x/7-(2/8) = 0
x/7-1/4 = 0
1/7*x-1/4 = 0 // + 1/4
1/7*x = 1/4 // : 1/7
x = 1/4/1/7
x = 7/4
x = 7/4
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