4/7d-9=-d-178/21

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Solution for 4/7d-9=-d-178/21 equation: 


d in (-oo:+oo)

(4/7)*d-9 = -d-(178/21) // + -d-(178/21)

(4/7)*d+d+178/21-9 = 0

11/7*d-11/21 = 0 // + 11/21

11/7*d = 11/21 // : 11/7

d = 11/21/11/7

d = 1/3

d = 1/3

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