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x in (-oo:+oo)
2*x+7 = 61/11 // - 61/11
2*x-(61/11)+7 = 0
2*x-61/11+7 = 0
2*x+16/11 = 0 // - 16/11
2*x = -16/11 // : 2
x = -16/11/2
x = -8/11
x = -8/11
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