3(1-x)-(1-2x)=9 Prosze o pomoc z gory dzieki

3(1-x) - (1-2x) = 9 3 - 3x - 1 + 2x = 9 -3x + 2x = 9 + 1 - 3 -x = 7           /*(-1) x = -7

3(1-x)-(1-2x)=9 3-3x-1-2x=9 -x=9+1-3 -x=7 x=-7