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(5/2)*x+(1/2)*x = 3*x+(7/2)*x+28/2 // - 3*x+(7/2)*x+28/2
(5/2)*x+(1/2)*x-(3*x)-((7/2)*x)-(28/2) = 0
(5/2)*x+(1/2)*x-3*x+(-7/2)*x-14 = 0
-7/2*x-14 = 0 // + 14
-7/2*x = 14 // : -7/2
x = 14/(-7/2)
x = -4
x = -4
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