40=-4/7k

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Solution for 40=-4/7k equation: 


k in (-oo:+oo)

40 = (-4/7)*k // - (-4/7)*k

40-((-4/7)*k) = 0

(4/7)*k+40 = 0

4/7*k+40 = 0 // - 40

4/7*k = -40 // : 4/7

k = -40/4/7

k = -70

k = -70

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