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y in (-oo:+oo)
(3*(y-7))/2 = -2*y // + -2*y
(3*(y-7))/2-(-2*y) = 0
(3*(y-7))/2+2*y = 0
(3*(y-7))/2+(2*2*y)/2 = 0
3*(y-7)+2*2*y = 0
7*y-21 = 0
(7*y-21)/2 = 0
(7*y-21)/2 = 0 // * 2
7*y-21 = 0
7*y-21 = 0 // + 21
7*y = 21 // : 7
y = 21/7
y = 3
y = 3
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