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y in (-oo:+oo)
7-12 = -y/3 // + -y/3
7-(-y/3)-12 = 0
(1/3)*y-12+7 = 0
1/3*y-5 = 0 // + 5
1/3*y = 5 // : 1/3
y = 5/1/3
y = 15
y = 15
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