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x in (-oo:+oo)
2*x+1/7 = -97/7 // + -97/7
2*x+1/7-(-97/7) = 0
2*x+1/7+97/7 = 0
2*x+14 = 0 // - 14
2*x = -14 // : 2
x = -14/2
x = -7
x = -7
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