2. Решите уравнения и выполните проверку: a) 33x17x + 14 = 558; б) 988(7x-18) = 26; в) 453-19х12x6x 9.

2. Решите уравнения и выполните проверку: a) $$33x - 17x + 14 = 558$$ $$16x = 558 - 14$$ $$16x = 544$$ $$x = \frac{544}{16}$$ $$x = 34$$ Проверка: $$33 \cdot 34 - 17 \cdot 34 + 14 = 558$$ $$1122 - 578 + 14 = 558$$ $$544 + 14 = 558$$ $$558 = 558$$ Ответ: x = 34 б) $$988 \div (7x-18) = 26$$ $$7x - 18 = \frac{988}{26}$$ $$7x - 18 = 38$$ $$7x = 38 + 18$$ $$7x = 56$$ $$x = \frac{56}{7}$$ $$x = 8$$ Проверка: $$988 \div (7 \cdot 8 - 18) = 26$$ $$988 \div (56 - 18) = 26$$ $$988 \div 38 = 26$$ $$26 = 26$$ Ответ: x = 8 в) $$453 - 19x - 12x - 6x = 9$$ $$453 - 37x = 9$$ $$-37x = 9 - 453$$ $$-37x = -444$$ $$x = \frac{-444}{-37}$$ $$x = 12$$ Проверка: $$453 - 19 \cdot 12 - 12 \cdot 12 - 6 \cdot 12 = 9$$ $$453 - 228 - 144 - 72 = 9$$ $$225 - 144 - 72 = 9$$ $$81 - 72 = 9$$ $$9 = 9$$ Ответ: x = 12