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a in (-oo:+oo)
a-1 = 4*a-37 // - 4*a-37
a-(4*a)-1+37 = 0
a-4*a-1+37 = 0
36-3*a = 0 // - 36
-3*a = -36 // : -3
a = -36/(-3)
a = 12
a = 12
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