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d in (-oo:+oo)
(3/4)*d+(4/7)*d+1/2 = 65/56 // - 65/56
(3/4)*d+(4/7)*d+1/2-(65/56) = 0
(3/4)*d+(4/7)*d+1/2-65/56 = 0
37/28*d-37/56 = 0 // + 37/56
37/28*d = 37/56 // : 37/28
d = 37/56/37/28
d = 1/2
d = 1/2
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