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y in (-oo:+oo)
y/50 = 35/20 // - 35/20
y/50-(35/20) = 0
y/50-7/4 = 0
1/50*y-7/4 = 0 // + 7/4
1/50*y = 7/4 // : 1/50
y = 7/4/1/50
y = 175/2
y = 175/2
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