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y in (-oo:+oo)
4.2/0.7 = (12/2)*y // - (12/2)*y
4.2/0.7-((12/2)*y) = 0
4.2/0.7-6*y = 0
6-6*y = 0 // - 6
-6*y = -6 // : -6
y = -6/(-6)
y = 1
y = 1
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