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a in (-oo:+oo)
(3/7)*a+1/3 = -38/21 // + -38/21
(3/7)*a+1/3-(-38/21) = 0
(3/7)*a+1/3+38/21 = 0
3/7*a+15/7 = 0 // - 15/7
3/7*a = -15/7 // : 3/7
a = -15/7/3/7
a = -5
a = -5
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