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(5/2)*x+(1/2)*x = (7/2)*x+9 // - (7/2)*x+9
(5/2)*x+(1/2)*x-((7/2)*x)-9 = 0
(5/2)*x+(1/2)*x+(-7/2)*x-9 = 0
-1/2*x-9 = 0 // + 9
-1/2*x = 9 // : -1/2
x = 9/(-1/2)
x = -18
x = -18
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