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d in (-oo:+oo)
2*(-(5*d)-10) = 70 // - 70
2*(-(5*d)-10)-70 = 0
2*(-5*d-10)-70 = 0
2*(-5*d-10)-70 = 0
-10*d-90 = 0
-10*d-90 = 0
-10*d-90 = 0 // + 90
-10*d = 90 // : -10
d = 90/(-10)
d = -9
d = -9
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