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a in (-oo:+oo)
554/7 = -6*a-(2*a)-(6/7) // + -6*a-(2*a)-(6/7)
2*a-(-6*a)+554/7+6/7 = 0
6*a+2*a+554/7+6/7 = 0
8*a+80 = 0 // - 80
8*a = -80 // : 8
a = -80/8
a = -10
a = -10
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