Question

Sabendo que a//b//c, determine o valor de X:

Answer 1

$a) \: \frac{3x + 1}{10} = \frac{5x - 2}{15} \\ \\ 15 \times (3x + 1) = 10 \times (5x - 2) \\ 45x + 15 = 50x - 20 \\ 50x - 45x = 20 + 15 \\ 5x = 35 \\ x = 35 \div 5 \\ x = 7$
$b) \: \frac{12}{2x - 2} = \frac{21}{3x + 1} \\ \\ 21 \times (2x - 2) = 12 \times (3x + 1) \\ 42x - 42 = 36x + 12 \\ 42x - 36x = 12 + 42 \\ 6x = 54 \\ x = 54 \div 6 \\ x = 9$


Espero ter ajudado ;)