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a in (-oo:+oo)
7*a-(5*a)+10 = -10 // + 10
7*a-(5*a)+10+10 = 0
7*a-5*a+10+10 = 0
2*a+20 = 0 // - 20
2*a = -20 // : 2
a = -20/2
a = -10
a = -10
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