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a in (-oo:+oo)
a-3 = 37-7*a // - 37-7*a
a-(-7*a)-37-3 = 0
a+7*a-37-3 = 0
8*a-40 = 0 // + 40
8*a = 40 // : 8
a = 40/8
a = 5
a = 5
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