Question

(x - 5)/10 + (1 - 2x)/5 = (3-x)/4

Answer 1

$\dfrac{x-5}{10} + \dfrac{1-2x}{5} = \dfrac{3-x}{4} \to~~ mmc=20\\\\ 2x-10+4-8x=15-5x\to\\\\ 2x-8x+5x=15+10-4\to\\\\ -x=21~(-1)\to\\ \\ \large\boxed{x=-21}$