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y in (-oo:+oo)
(1/2)*y-4/3 = -7/5 // + -7/5
(1/2)*y-4/3-(-7/5) = 0
(1/2)*y-4/3+7/5 = 0
1/2*y+1/15 = 0 // - 1/15
1/2*y = -1/15 // : 1/2
y = -1/15/1/2
y = -2/15
y = -2/15
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