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a in (-oo:+oo)
5*(4-a) = -15 // + 15
5*(4-a)+15 = 0
5*(4-a)+15 = 0
35-5*a = 0
35-5*a = 0
35-5*a = 0 // - 35
-5*a = -35 // : -5
a = -35/(-5)
a = 7
a = 7
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