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d in (-oo:+oo)
2-5*d = -2*d-19 // + -2*d-19
2-5*d-(-2*d)+19 = 0
2*d-5*d+2+19 = 0
21-3*d = 0 // - 21
-3*d = -21 // : -3
d = -21/(-3)
d = 7
d = 7
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