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x in (-oo:+oo)
x+x+5/2+1/7 = 4 // - 4
x+x+5/2+1/7-4 = 0
2*x-19/14 = 0 // + 19/14
2*x = 19/14 // : 2
x = 19/14/2
x = 19/28
x = 19/28
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