Question

Resolva a equação 3(3 – m) + m/7 = 7
ME AJUDEM!!​

Answer 1

3(3 – m) + m/7 = 7 ====> *(7) mmc

21(3-m) + m = 49

63-21m +m = 49

-20m = 49 -63

-20m = -14

m= 14/20 = 7/10 ✓

Answer 2

$3(3 - m) + \frac{m}{7} = 7 \\ 9 - 3m + \frac{m}{7} = 7 \\ \frac{63 - 21m + m = 49}{7} \\ 63 - 21m + m = 49$

$- 21m + m = 49 - 63 \\ - 20m = - 14 \times ( -1) \\ 20m = 14 \\ m = \frac{14 \div 2}{20 \div 2}$

$m = \frac{7}{10}$