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d in (-oo:+oo)
15-(6*((5/9)*d-5))-7 = 0
15-6*((5/9)*d-5)-7 = 0
15-6*(5/9*d-5)-7 = 0
15-6*(5/9*d-5)-7 = 0
15-10/3*d+23 = 0
38-10/3*d = 0
38-10/3*d = 0
38-10/3*d = 0 // - 38
-10/3*d = -38 // : -10/3
d = -38/(-10/3)
d = 57/5
d = 57/5
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