Question

Resolva as seguintes equações
a) 3 ( x –2) = 4(3 – x)
b) 3 ( 3x – 1) = 2 ( 3x + 2)
c) 7 ( x – 2 ) = 5 ( x + 3 )
d) 3 (2x – 1) = -2 ( x + 3)
e) 5x – 3( x +2) = 15

Answer 1

Resposta:

a) 3 ( x –2) = 4(3 – x)

3x -6 = 12 -4 x

3x +4x = 12+6

7x = 18

x =  $\frac{18}{7}$

x = 2,57

b)  3 ( 3x – 1) = 2 ( 3x + 2)

9x -3 = 6x +4

9x - 6x = 3+4

3x = 7

x =  $\frac{7}{3}$

x = 2,3

c) 7 ( x – 2 ) = 5 ( x + 3 )

7x -14 = 5x +15

7x-5x = 15+14

2x = 29

x =  $\frac{29}{2}$

x = 14,5

d) 3 (2x – 1) = -2 ( x + 3)

6x -3 = -2x -6

6x +2x = -6 +3

8x = -3

x =  $\frac{-3}{8}$

x = -0,375

e)   5x – 3( x +2) = 15

5x - 3x - 6 = 15

2x = 15 + 6  

2x = 21

x =  $\frac{21}{2}$

x = 10,5