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a in (-oo:+oo)
600*a = 800*(a-(3/4)) // - 800*(a-(3/4))
600*a-(800*(a-(3/4))) = 0
600*a-800*(a-3/4) = 0
600*a-800*(a-3/4) = 0
600-200*a = 0
600-200*a = 0
600-200*a = 0 // - 600
-200*a = -600 // : -200
a = -600/(-200)
a = 3
a = 3
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