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y in (-oo:+oo)
-12 = 7-((2*y)/3) // - 7-((2*y)/3)
(2*y)/3-12-7 = 0
2/3*y-19 = 0 // + 19
2/3*y = 19 // : 2/3
y = 19/2/3
y = 57/2
y = 57/2
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