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y in (-oo:+oo)
4*y-(1/7) = 4 // - 4
4*y-(1/7)-4 = 0
4*y-1/7-4 = 0
4*y-29/7 = 0 // + 29/7
4*y = 29/7 // : 4
y = 29/7/4
y = 29/28
y = 29/28
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