Question

Determine o valor de x:

a) 3x + 9 = 2x - 11

b) -4x = 2x + 8

c) 10x + 16 = 2x - 16

d) 24 - 2x = 4

me ajudem, por favor!!

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Answer 1

a) 3x = 9 = 2x - 11

3x - 2x = -11 - 9

x = -20

b) -4x = 2x + 8

-4x - 2x = 8

-6x = 8

-x = $\frac{8}{6}$ . (-1)

x = $\frac{-8}{6}$

x = $\frac{4}{3}$

c) 10x + 16 = 2x - 16

10x - 2x = -16 - 16

8x = -36

x = $\frac{-36}{8}$

x = $\frac{9}{2}$

d) 24 - 2x = 4

-2x = 4 - 24

-2x = -20 . (-1)

x = $\frac{20}{2}$

x = 10