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a in (-oo:+oo)
4-5*a-(5*a) = -36 // + 36
4-5*a-(5*a)+36 = 0
4-5*a-5*a+36 = 0
40-10*a = 0 // - 40
-10*a = -40 // : -10
a = -40/(-10)
a = 4
a = 4
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