3x+1/2x=10-x 3 1/2x=10-x 4 1/2x=10 /4 1/2 x=2,(2)
3x+1/2x=10- x 3x + x + 1/2x = 10 4,5x = 10/:4,5 x = 10 : 45/10 x = 10 * 10/45 x = 20/9