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y in (-oo:+oo)
y/4 = 42/28 // - 42/28
y/4-(42/28) = 0
y/4-3/2 = 0
1/4*y-3/2 = 0 // + 3/2
1/4*y = 3/2 // : 1/4
y = 3/2/1/4
y = 6
y = 6
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