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x in (-oo:+oo)
x/4+x/7 = 11/28 // - 11/28
x/4+x/7-(11/28) = 0
x/4+x/7-11/28 = 0
11/28*x-11/28 = 0 // + 11/28
11/28*x = 11/28 // : 11/28
x = 11/28/11/28
x = 1
x = 1
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