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y in (-oo:+oo)
(4*(y-7))/5 = -3*y // + -3*y
(4*(y-7))/5-(-3*y) = 0
(4*(y-7))/5+3*y = 0
(4*(y-7))/5+(3*5*y)/5 = 0
4*(y-7)+3*5*y = 0
19*y-28 = 0
(19*y-28)/5 = 0
(19*y-28)/5 = 0 // * 5
19*y-28 = 0
19*y-28 = 0 // + 28
19*y = 28 // : 19
y = 28/19
y = 28/19
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