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a in (-oo:+oo)
7*a-(4*a)+4 = 10 // - 10
7*a-(4*a)-10+4 = 0
7*a-4*a-10+4 = 0
3*a-6 = 0 // + 6
3*a = 6 // : 3
a = 6/3
a = 2
a = 2
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