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y in (-oo:+oo)
68/7-(12*y) = -4 // + 4
68/7-(12*y)+4 = 0
68/7-12*y+4 = 0
96/7-12*y = 0 // - 96/7
-12*y = -96/7 // : -12
y = -96/7/(-12)
y = 8/7
y = 8/7
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