X-260=350 и x+370=870 примеры
1) x - 260 = 350 => x = 260 + 350 => x = 610. 2) x + 370 = 870 => x = 870 - 370 => x = 500.
1. Х-260=350 Х=350-260 Х=90 2.х+370=870 х=870-370 х=500