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a in (-oo:+oo)
37 = 7*a-(2*a)+7 // - 7*a-(2*a)+7
2*a-(7*a)-7+37 = 0
2*a-7*a-7+37 = 0
30-5*a = 0 // - 30
-5*a = -30 // : -5
a = -30/(-5)
a = 6
a = 6
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