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a in (-oo:+oo)
(-1/7)*a+7*a-10 = 26/7 // - 26/7
(-1/7)*a+7*a-(26/7)-10 = 0
(-1/7)*a+7*a-26/7-10 = 0
48/7*a-96/7 = 0 // + 96/7
48/7*a = 96/7 // : 48/7
a = 96/7/48/7
a = 2
a = 2
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