3/20x + 7/10=- 4/15x +9/10x- 7/6-1/15
3/20x + 7/10=- 4/15x +9/10x- 7/6-1/15
3/20·x + 7/10 = - 4/15·x + 9/10·x - 7/6 - 1/15
3/20·x + 4/15·x - 9/10·x = - 7/6 - 1/15 - 7/10
- 29·x/60 = - 29/15
x = 4
3x/20 + 7/10 = - 4x/15 + 9x/10 - 7/6 - 1/15
3x/20 + 4x/15 - 9x/10 = - 7/6 - 1/15 - 7/10
x(9+16-54)/60 = (-70-4-42/60
-29x = -116
x = 4