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x in (-oo:+oo)
x = ((1/1)/20)*k+(1/15)*k+(1/45)*k // - ((1/1)/20)*k+(1/15)*k+(1/45)*k
x-(((1/1)/20)*k)-((1/15)*k)-((1/45)*k) = 0
(-1/20)*k+(-1/15)*k+(-1/45)*k+x = 0
x-5/36*k = 0 // + -5/36*k
x = -(-5/36*k)
x = 5/36*k
x = 5/36*k
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