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x in (-oo:+oo)
x/4+1/6 = x/7 // - x/7
x/4-(x/7)+1/6 = 0
3/28*x+1/6 = 0 // - 1/6
3/28*x = -1/6 // : 3/28
x = -1/6/3/28
x = -14/9
x = -14/9
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