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x in (-oo:+oo)
35/100 = x/28 // - x/28
35/100-(x/28) = 0
7/20-1/28*x = 0 // - 7/20
-1/28*x = -7/20 // : -1/28
x = -7/20/(-1/28)
x = 49/5
x = 49/5
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