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(9/2)*x+3*x+18 = 11/2 // - 11/2
(9/2)*x+3*x-(11/2)+18 = 0
(9/2)*x+3*x-11/2+18 = 0
15/2*x+25/2 = 0 // - 25/2
15/2*x = -25/2 // : 15/2
x = -25/2/15/2
x = -5/3
x = -5/3
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