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y in (-oo:+oo)
y/7+1/4 = 2*y // - 2*y
y/7-(2*y)+1/4 = 0
y/7-2*y+1/4 = 0
1/4-13/7*y = 0 // - 1/4
-13/7*y = -1/4 // : -13/7
y = -1/4/(-13/7)
y = 7/52
y = 7/52
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