Question

calcule o valor de x -7x=-21​

Answer 1

Resposta:

S = {7/2}

Explicação passo-a-passo:

$x - 7x = - 21 \\ - 6x = - 21 \\ 6x = 21 \\ x = \frac{21}{6} \\ x = \frac{21 \div 3}{6 \div 3} \\ x = \frac{7}{2}$

Answer 2

x - 7x= -21

(-1) -6x=-21 (-1)

6x=21

x=21/6

$\frac{21 \div 3}{6 \div 3} = x$

$\frac{7}{2} = x$

S=

$\frac{7}{2}$