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x in (-oo:+oo)
5*x-(d/6) = 2*x // - 2*x
5*x-(d/6)-(2*x) = 0
5*x-(d/6)-2*x = 0
3*x-1/6*d = 0 // + -1/6*d
3*x = -(-1/6*d) // : 3
x = (-(-1/6*d))/3
x = 1/18*d
x = 1/18*d
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