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a in (-oo:+oo)
(2/5)*a-7 = -51/5 // + -51/5
(2/5)*a-(-51/5)-7 = 0
(2/5)*a+51/5-7 = 0
2/5*a+16/5 = 0 // - 16/5
2/5*a = -16/5 // : 2/5
a = -16/5/2/5
a = -8
a = -8
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