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(1/2)*(2*y+4)-8 = (1/9)*(27*y-54) // - (1/9)*(27*y-54)
(1/2)*(2*y+4)-((1/9)*(27*y-54))-8 = 0
(1/2)*(2*y+4)+(-1/9)*(27*y-54)-8 = 0
1/2*(2*y+4)-1/9*(27*y-54)-8 = 0
1/2*(2*y+4)-1/9*(27*y-54)-8 = 0
8-2*y-8 = 0
-2*y = 0
-2*y = 0
-2*y = 0 // : -2
y = 0
y = 0
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