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y in (-oo:+oo)
1.8 = y/4 // - y/4
1.8-(y/4) = 0
1.8-1/4*y = 0 // - 1.8
-1/4*y = -1.8 // : -1/4
y = -1.8/(-1/4)
y = 7.2
y = 7.2
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