(x-5)/10+(1-2x)/5=(3-x)/4
(x-5)/10+(1-2x)/5=(3-x)/4 tirando o mmc
(x-5 +2(1-2x))/10=(3-x)/4
(x-4x-5+2)/10=(3-x)/4
(-3x-3)/10=(3-x)/4
4(-3x-3)=(3-x)10
-12x-12=30-10x
-12x+10x=30+12
-2X=42
X=-42/2=-21
