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a in (-oo:+oo)
4*(2*a-3) = -36 // + 36
4*(2*a-3)+36 = 0
4*(2*a-3)+36 = 0
8*a+24 = 0
8*a+24 = 0
8*a+24 = 0 // - 24
8*a = -24 // : 8
a = -24/8
a = -3
a = -3
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