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x in (-oo:+oo)
-3*x = -d/7 // + -d/7
-(-d/7)-3*x = 0
(1/7)*d-3*x = 0
1/7*d-3*x = 0 // - 1/7*d
-3*x = -(1/7*d) // : -3
x = (-(1/7*d))/(-3)
x = 1/21*d
x = 1/21*d
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