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x in (-oo:+oo)
10*(35-(x/5)) = 10*(x/2) // - 10*(x/2)
10*(35-(x/5))-(10*(x/2)) = 0
10*(35-(x/5))-5*x = 0
10*(35-1/5*x)-5*x = 0
10*(35-1/5*x)-5*x = 0
350-7*x = 0
350-7*x = 0
350-7*x = 0 // - 350
-7*x = -350 // : -7
x = -350/(-7)
x = 50
x = 50
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