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(5/2)*x+9 = x+15/2 // - x+15/2
(5/2)*x-x-(15/2)+9 = 0
(5/2)*x-x-15/2+9 = 0
3/2*x+3/2 = 0 // - 3/2
3/2*x = -3/2 // : 3/2
x = -3/2/3/2
x = -1
x = -1
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