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x in (-oo:+oo)
x/4+x/14 = 9/4 // - 9/4
x/4+x/14-(9/4) = 0
x/4+x/14-9/4 = 0
9/28*x-9/4 = 0 // + 9/4
9/28*x = 9/4 // : 9/28
x = 9/4/9/28
x = 7
x = 7
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