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(9/5)*(3-x) = (3/4)*(x-3) // - (3/4)*(x-3)
(9/5)*(3-x)-((3/4)*(x-3)) = 0
(9/5)*(3-x)+(-3/4)*(x-3) = 0
9/5*(3-x)-3/4*(x-3) = 0
9/5*(3-x)-3/4*(x-3) = 0
153/20-51/20*x = 0
153/20-51/20*x = 0
153/20-51/20*x = 0 // - 153/20
-51/20*x = -153/20 // : -51/20
x = -153/20/(-51/20)
x = 3
x = 3
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