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x in (-oo:+oo)
(1/5)*x = (4/9)*d // - (4/9)*d
(1/5)*x-((4/9)*d) = 0
(-4/9)*d+(1/5)*x = 0
1/5*x-4/9*d = 0 // + -4/9*d
1/5*x = -(-4/9*d) // : 1/5
x = (-(-4/9*d))/1/5
x = 20/9*d
x = 20/9*d
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