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a in (-oo:+oo)
6*a-a-(2/7) = -72/7 // + -72/7
6*a-a-(2/7)-(-72/7) = 0
6*a-a-2/7+72/7 = 0
5*a+10 = 0 // - 10
5*a = -10 // : 5
a = -10/5
a = -2
a = -2
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