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a in (-oo:+oo)
3*a-((4/7)*a)+8 = 226/7 // - 226/7
3*a-((4/7)*a)-(226/7)+8 = 0
3*a+(-4/7)*a-226/7+8 = 0
17/7*a-170/7 = 0 // + 170/7
17/7*a = 170/7 // : 17/7
a = 170/7/17/7
a = 10
a = 10
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