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(5/2)*x+(1/2)*x = (9/2)*x+131/2 // - (9/2)*x+131/2
(5/2)*x+(1/2)*x-((9/2)*x)-(131/2) = 0
(5/2)*x+(1/2)*x+(-9/2)*x-131/2 = 0
-3/2*x-131/2 = 0 // + 131/2
-3/2*x = 131/2 // : -3/2
x = 131/2/(-3/2)
x = -131/3
x = -131/3
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