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d in (-oo:+oo)
5*d+9/10 = 7*d+229/10 // - 7*d+229/10
5*d-(7*d)+9/10-(229/10) = 0
5*d-7*d+9/10-229/10 = 0
-2*d-22 = 0 // + 22
-2*d = 22 // : -2
d = 22/(-2)
d = -11
d = -11
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