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y in (-oo:+oo)
(7*(y-3))/3 = -4*y // + -4*y
(7*(y-3))/3-(-4*y) = 0
(7*(y-3))/3+4*y = 0
(7*(y-3))/3+(3*4*y)/3 = 0
7*(y-3)+3*4*y = 0
19*y-21 = 0
(19*y-21)/3 = 0
(19*y-21)/3 = 0 // * 3
19*y-21 = 0
19*y-21 = 0 // + 21
19*y = 21 // : 19
y = 21/19
y = 21/19
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