Question

Encontre o valor de X nas equações.
A)7×=5
B)12+9=-4×4
C)10×-8×=-4
D)-3×+9×+12=-8-8
E)-5×+2×=-3+8-4+2×

Answer 1

a) 7x=5

$x = \frac{5}{7}$
b) 12+9=-4×4
$4x = 4 - 12 - 9 \\ 4x = - 17 \\ x = - \frac{17}{4}$
c)10×-8×=-4
$2x = - 4 \\ x = - \frac{4}{2} \\ x = - 2$
d) -3×+9×+12=-8-8
$- 3x + 9x = - 8 - 8 - 12 \\ 6x = - 28 \\ x = \frac{28}{6}$
e))-5×+2×=-3+8-4+2×
$- 5x + 2x - 2x = - 3 + 8 - 4 \\ 5x = 1 \\ x = \frac{1}{5}$