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y in (-oo:+oo)
(y+4)/5 = 30 // - 30
(y+4)/5-30 = 0
(y+4)/5+(-30*5)/5 = 0
y-30*5+4 = 0
y-146 = 0
(y-146)/5 = 0
(y-146)/5 = 0 // * 5
y-146 = 0
y-146 = 0 // + 146
y = 146
y = 146
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