Question

calcule o valor de x x+5=7

Answer 1

Xx+5=7
2x+5=7
7x=7÷7=1
X=1

Answer 2

a)
$x + 5 = 7 \\ x = 7 - 5 \\ x = 2$
b)
$x + 12 = 10 \\ x = 10 - 12 \\ x = 2$
c)
$x - 5 = 6 \\ x = 6 + 5 \\ x = 11$
d)
$9x = 27 \\ x = \frac{27}{9} \\ x = 3$
e)
$\frac{x}{4} = 6 \\ x = 6 \times 4 \\ x = 24$
f)
$16x = - 32 \\ x = \frac{ - 32}{16} \\ x = - 2$
g)
$0.7x = 1.4 \\ x = \frac{1.4}{0.7} \\ x = 2$
h)
$- 5x = 30 \\ x = \frac{30}{ - 5} \\ x = - 6$
i)
$\frac{x}{ - 2} = 5 \\ x = 5 \times - 2 \\ x = - 10$
j)
$\frac{x}{ - 4} = - 6 \\ x = \frac{ - 6}{ - 4} \\ x = 1.5$