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a in (-oo:+oo)
2-(5*a) = 37 // - 37
2-(5*a)-37 = 0
2-5*a-37 = 0
-5*a-35 = 0 // + 35
-5*a = 35 // : -5
a = 35/(-5)
a = -7
a = -7
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