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(4/5)*x+(1/8)*x = x+9/8 // - x+9/8
(4/5)*x+(1/8)*x-x-(9/8) = 0
(4/5)*x+(1/8)*x-x-9/8 = 0
-3/40*x-9/8 = 0 // + 9/8
-3/40*x = 9/8 // : -3/40
x = 9/8/(-3/40)
x = -15
x = -15
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