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(5/2)*x+(1/2)*x = 4*x+(9/2)*x+11/2 // - 4*x+(9/2)*x+11/2
(5/2)*x+(1/2)*x-(4*x)-((9/2)*x)-(11/2) = 0
(5/2)*x+(1/2)*x-4*x+(-9/2)*x-11/2 = 0
-11/2*x-11/2 = 0 // + 11/2
-11/2*x = 11/2 // : -11/2
x = 11/2/(-11/2)
x = -1
x = -1
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