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y in (-oo:+oo)
(3*(y-7))/4 = -2*y // + -2*y
(3*(y-7))/4-(-2*y) = 0
(3*(y-7))/4+2*y = 0
(3*(y-7))/4+(2*4*y)/4 = 0
3*(y-7)+2*4*y = 0
11*y-21 = 0
(11*y-21)/4 = 0
(11*y-21)/4 = 0 // * 4
11*y-21 = 0
11*y-21 = 0 // + 21
11*y = 21 // : 11
y = 21/11
y = 21/11
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