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y in (-oo:+oo)
-7.7 = y/4-1.3 // - y/4-1.3
1.3-(y/4)-7.7 = 0
-1/4*y-6.4 = 0 // + 6.4
-1/4*y = 6.4 // : -1/4
y = 6.4/(-1/4)
y = -25.6
y = -25.6
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