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x in (-oo:+oo)
700-(60*x) = (400/60)*x // - (400/60)*x
700-(60*x)-((400/60)*x) = 0
(-20/3)*x-60*x+700 = 0
700-200/3*x = 0 // - 700
-200/3*x = -700 // : -200/3
x = -700/(-200/3)
x = 21/2
x = 21/2
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