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y in (-oo:+oo)
(1/9)*y-7 = 2/4 // - 2/4
(1/9)*y-(2/4)-7 = 0
(1/9)*y-1/2-7 = 0
1/9*y-15/2 = 0 // + 15/2
1/9*y = 15/2 // : 1/9
y = 15/2/1/9
y = 135/2
y = 135/2
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