Question

Por favor!! Me ajudem! Só as questões 1 e 2

Answer 1

Resposta:

a) 25x - 17 = 10x + 28

25x - 10x = 28 + 17

15x = 45

x = 45/15 = 3

b)7x + 40 = 11x + 60 - 2x

- 60 + 40 = 11x - 7x - 2x

2x = - 20

x = - 20/2 = -10

c) 5 (x - 2) - 7 (x + 1) = 9 (3 - 2x)

5x - 10 - 7x - 7 = 27 - 18x

5x - 7x + 18x = 27 + 7 + 10

16x = 44

x = (44/16)/4 = 11/4

d) 6 (x - 3) - 4 (x + 2) = 9x - (5x + 3)

6x - 18 - 4x - 8 = 9x - 5x - 3

6x - 4x - 9x + 5x = - 3 + 8 + 18

- 2x = 23 (-1)

2x = 23

x = 23/2

e) >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

$e)x - \frac{x}{6} = \frac{x}{3} + \frac{7}{2} \\ \frac{6x - x}{6} = \frac{2x + 21}{6} \\ 6x - x = 2x + 21$

$5x - 2x = 21 \\ 3x = 21 \\ x = \frac{21}{3} = 7$

f) >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

$f)3x - \frac{5 - 3x}{2} = 2(x - 5) \\ \frac{6x - 5 - 3x}{2} = 2x - 10 \\ 6x - 5 - 3x = 4x - 20$

$6x - 3x - 4x = - 20 + 5 \\ - x = - 15( - 1) \\ x = 15$

2) >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

$\frac{5x - 3}{2} - \frac{4}{5} + \frac{2x}{3} = \frac{17x - 8}{3} - \frac{1}{2} \\ \frac{75x - 45 - 24 + 20x}{30} = \frac{34x - 16 - 3}{6} \\ \frac{95x - 69}{30} = \frac{34x - 19}{6} \\ 570x - 414 = 1020x - 570 \\ 1020x - 570x = 570 - 414 \\ 450x = 156 \\ x = \frac{156}{450} \div \frac{6}{6} = \frac{26}{75}$