3.205 Найдите корень уравнения: a) 6a + 6a = 636; б) 15b - 8b = 721; в) 9t + t = 7000; г) 10s - s = 540;

Ответ (RU):

a) $$6a + 6a = 636$$

$$12a = 636$$

$$a = \frac{636}{12} = 53$$

б) $$15b - 8b = 721$$

$$7b = 721$$

$$b = \frac{721}{7} = 103$$

в) $$9t + t = 7000$$

$$10t = 7000$$

$$t = \frac{7000}{10} = 700$$

г) $$10s - s = 540$$

$$9s = 540$$

$$s = \frac{540}{9} = 60$$