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a in (-oo:+oo)
10-a = 2*a+37 // - 2*a+37
10-a-(2*a)-37 = 0
10-a-2*a-37 = 0
-3*a-27 = 0 // + 27
-3*a = 27 // : -3
a = 27/(-3)
a = -9
a = -9
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