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a in (-oo:+oo)
4*(2*a-7) = 60 // - 60
4*(2*a-7)-60 = 0
4*(2*a-7)-60 = 0
8*a-88 = 0
8*a-88 = 0
8*a-88 = 0 // + 88
8*a = 88 // : 8
a = 88/8
a = 11
a = 11
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