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y in (-oo:+oo)
y/(-7)-0.5 = -2 // + 2
y/(-7)-0.5+2 = 0
1.5-1/7*y = 0 // - 1.5
-1/7*y = -1.5 // : -1/7
y = -1.5/(-1/7)
y = 10.50000021
y = 10.50000021
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