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a in (-oo:+oo)
4*a+4*a-2/7 = 106/21 // - 106/21
4*a+4*a-2/7-(106/21) = 0
4*a+4*a-2/7-106/21 = 0
8*a-16/3 = 0 // + 16/3
8*a = 16/3 // : 8
a = 16/3/8
a = 2/3
a = 2/3
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