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a in (-oo:+oo)
(2/5)*(a-10)-5 = -19 // + 19
(2/5)*(a-10)-5+19 = 0
2/5*(a-10)-5+19 = 0
2/5*(a-10)-5+19 = 0
2/5*a-9+19 = 0
2/5*a+10 = 0
2/5*a+10 = 0
2/5*a+10 = 0 // - 10
2/5*a = -10 // : 2/5
a = -10/2/5
a = -25
a = -25
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