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a in (-oo:+oo)
(3/7)*(a-2) = 2 // - 2
(3/7)*(a-2)-2 = 0
3/7*(a-2)-2 = 0
3/7*(a-2)-2 = 0
3/7*a-20/7 = 0
3/7*a-20/7 = 0
3/7*a-20/7 = 0 // + 20/7
3/7*a = 20/7 // : 3/7
a = 20/7/3/7
a = 20/3
a = 20/3
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