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a in (-oo:+oo)
5*a-(7*a)+10 = -4 // + 4
5*a-(7*a)+4+10 = 0
5*a-7*a+4+10 = 0
14-2*a = 0 // - 14
-2*a = -14 // : -2
a = -14/(-2)
a = 7
a = 7
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