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y in (-oo:+oo)
(2/5)*y+7 = 3/5-4 // - 3/5-4
(2/5)*y-(3/5)+4+7 = 0
(2/5)*y-3/5+4+7 = 0
2/5*y+52/5 = 0 // - 52/5
2/5*y = -52/5 // : 2/5
y = -52/5/2/5
y = -26
y = -26
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