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d in (-oo:+oo)
7*(4-(3*d)) = 175 // - 175
7*(4-(3*d))-175 = 0
7*(4-3*d)-175 = 0
7*(4-3*d)-175 = 0
-21*d-147 = 0
-21*d-147 = 0
-21*d-147 = 0 // + 147
-21*d = 147 // : -21
d = 147/(-21)
d = -7
d = -7
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