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a in (-oo:+oo)
7*a-5*a+2 = 7/2 // - 7/2
7*a-5*a-(7/2)+2 = 0
7*a-5*a-7/2+2 = 0
2*a-3/2 = 0 // + 3/2
2*a = 3/2 // : 2
a = 3/2/2
a = 3/4
a = 3/4
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