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a in (-oo:+oo)
-37 = 8-3*a-(6*a) // - 8-3*a-(6*a)
6*a-(-3*a)-37-8 = 0
3*a+6*a-37-8 = 0
9*a-45 = 0 // + 45
9*a = 45 // : 9
a = 45/9
a = 5
a = 5
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