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y in (-oo:+oo)
(7/10)*y+1/2 = 4 // - 4
(7/10)*y+1/2-4 = 0
7/10*y-7/2 = 0 // + 7/2
7/10*y = 7/2 // : 7/10
y = 7/2/7/10
y = 5
y = 5
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