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a in (-oo:+oo)
2*a+1/7 = -27/7 // + -27/7
2*a+1/7-(-27/7) = 0
2*a+1/7+27/7 = 0
2*a+4 = 0 // - 4
2*a = -4 // : 2
a = -4/2
a = -2
a = -2
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