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y in (-oo:+oo)
(4/7)*y-(3/14) = -1/2 // + -1/2
(4/7)*y-(3/14)-(-1/2) = 0
(4/7)*y-3/14+1/2 = 0
4/7*y+2/7 = 0 // - 2/7
4/7*y = -2/7 // : 4/7
y = -2/7/4/7
y = -1/2
y = -1/2
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