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y in (-oo:+oo)
(9/7)*(2*y-4) = 18 // - 18
(9/7)*(2*y-4)-18 = 0
9/7*(2*y-4)-18 = 0
9/7*(2*y-4)-18 = 0
18/7*y-162/7 = 0
18/7*y-162/7 = 0
18/7*y-162/7 = 0 // + 162/7
18/7*y = 162/7 // : 18/7
y = 162/7/18/7
y = 9
y = 9
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