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y in (-oo:+oo)
(2/3)*y-7 = 4 // - 4
(2/3)*y-7-4 = 0
2/3*y-11 = 0 // + 11
2/3*y = 11 // : 2/3
y = 11/2/3
y = 33/2
y = 33/2
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