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x in (-oo:+oo)
800 = (100/4)*x // - (100/4)*x
800-((100/4)*x) = 0
800-25*x = 0
800-25*x = 0 // - 800
-25*x = -800 // : -25
x = -800/(-25)
x = 32
x = 32
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