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x in (-oo:+oo)
800 = x+(1.5*x)/5 // - x+(1.5*x)/5
800-x-((1.5*x)/5) = 0
800-x-0.3*x = 0
800-1.3*x = 0 // - 800
-1.3*x = -800 // : -1.3
x = -800/(-1.3)
x = 615.38461538
x = 615.38461538
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