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y in (-oo:+oo)
(2/7)*y-2 = -23 // + 23
(2/7)*y-2+23 = 0
2/7*y+21 = 0 // - 21
2/7*y = -21 // : 2/7
y = -21/2/7
y = -147/2
y = -147/2
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