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(5/2)*x+(1/4)*x = x+9/4 // - x+9/4
(5/2)*x+(1/4)*x-x-(9/4) = 0
(5/2)*x+(1/4)*x-x-9/4 = 0
7/4*x-9/4 = 0 // + 9/4
7/4*x = 9/4 // : 7/4
x = 9/4/7/4
x = 9/7
x = 9/7
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