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x in (-oo:+oo)
x/2-1 = x/7-4 // - x/7-4
x/2-(x/7)-1+4 = 0
5/14*x+3 = 0 // - 3
5/14*x = -3 // : 5/14
x = -3/5/14
x = -42/5
x = -42/5
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