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x in (-oo:+oo)
(3.14/4)*x = 3*d // - 3*d
(3.14/4)*x-(3*d) = 0
(3.14/4)*x-3*d = 0
0.785*x-3*d = 0 // + -3*d
0.785*x = -(-3*d) // : 0.785
x = (-(-3*d))/0.785
x = 3.82165605*d
x = 3.82165605*d
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