X-230=100+20 i x-350=400+30
Х-230=100+20 х-230=120 х=120+230 х=350 х-350=400+30 х-350=430 х=430+350 х=780
1)х - 230 = 100 +20 х- 230 = 120 х= 230+ 120 х= 350 2)х-350=400+30 х-350=430 х= 350+430 х= 780