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a in (-oo:+oo)
7*a+1 = -53/10 // + -53/10
7*a-(-53/10)+1 = 0
7*a+53/10+1 = 0
7*a+63/10 = 0 // - 63/10
7*a = -63/10 // : 7
a = -63/10/7
a = -9/10
a = -9/10
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