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(3/4)*x+1/5 = 3*x-223/10 // - 3*x-223/10
(3/4)*x-(3*x)+1/5-(-223/10) = 0
(3/4)*x-3*x+1/5+223/10 = 0
45/2-9/4*x = 0 // - 45/2
-9/4*x = -45/2 // : -9/4
x = -45/2/(-9/4)
x = 10
x = 10
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