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a in (-oo:+oo)
4*(2*a-7) = 4 // - 4
4*(2*a-7)-4 = 0
4*(2*a-7)-4 = 0
8*a-32 = 0
8*a-32 = 0
8*a-32 = 0 // + 32
8*a = 32 // : 8
a = 32/8
a = 4
a = 4
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