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a in (-oo:+oo)
-34/7 = 2*a+3*a-7 // - 2*a+3*a-7
7-(2*a)-(3*a)-34/7 = 0
7-2*a-3*a-34/7 = 0
15/7-5*a = 0 // - 15/7
-5*a = -15/7 // : -5
a = -15/7/(-5)
a = 3/7
a = 3/7
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