Х+450=700, 280-а=190, х*30=60, 240:х=80 помогите пожалуйста

x + 450 = 700x = 700 - 450x = 250250 + 450 = 700700 = 700_______________280 - a = 190a = 280 - 190a = 90280 - 90 = 190190 = 190_______________x × 30 = 60x = 60 ÷ 30x = 22 × 30 = 6060 = 60_______________240 ÷ x = 80x = 240 ÷ 80x = 3240 ÷ 3 = 8080 = 80

Х+450=700. Х=700-450.х=250.280-а=190.а=280-190.а=90.х•30=60 х=60:30 х=20.240:х=80 х=240:80 х=3