Помогите! 2*4x+5x=130 3x+2x+x=72 4x+2x+x=35
8х + 5х = 130 13х = 130 х = 130 : 13 х = 10 ----------------------- 6х = 72 х = 72 : 6 х = 12 ----------------------- 7х = 35 х = 35 : 7 х = 5