Помогите плиз! Х+320=80х7 Х-180=240:3 400-Х=275+25
X+320=80*7; x+320=560; x=560-320; x=240. X-180=240:3;x-180=80; x=80+180; x=260. 400-x=275+25; 400-x=300; x=400-300; x=100