Question

7.(x-6)=21 pergunta de matematica

Answer 1

$7(x - 6) = 21 \\ x - 6 = \frac{21}{7} \\ x - 6 = 3 \\ x = 3 + 6 \\ x = 9$


S = {9}

Answer 2

Olá !


Resolução :


7(X - 6) = 21

7X - 42 = 21

7X = 21 + 42

7X = 63

X = 63/7

X = 9



Testando :


7(9 - 6) = 21

7 • 3 = 21

21 = 21


Comprovado .



Resposta : X = 9