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y in (-oo:+oo)
y/18 = 150/126 // - 150/126
y/18-(150/126) = 0
y/18-25/21 = 0
1/18*y-25/21 = 0 // + 25/21
1/18*y = 25/21 // : 1/18
y = 25/21/1/18
y = 150/7
y = 150/7
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