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x in (-oo:+oo)
x/2+x+1/7 = x-2 // - x-2
x/2+x-x+1/7+2 = 0
1/2*x+15/7 = 0 // - 15/7
1/2*x = -15/7 // : 1/2
x = -15/7/1/2
x = -30/7
x = -30/7
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