Question

resolva as equações a seguir:
a) 2×-7=-5×+1

b) 4×+13=43-×

c) 2×-3=1-(3-3×)

d) -3(×-1)+4=×/2-2

Answer 1

a) 2×-7=-5×+1

2x + 5x = 1 + 7

7x = 8

$x=\frac{8}{7}$

x = 1, 14

b) 4×+13=43-×

4x + x = 43 - 13

5x = 30

$x=\frac{30}{5}$

x = 6

c) 2×-3=1-(3-3×)

2x - 3 = 1 - 3 + 3x

- 3 - 1 + 3 = 3x - 2x

- 4 + 3 = 1x

- 1 = x

x = - 1

d) -3(×-1)+4=×/2-2

- 3x + 3 + 4 + 2 = x / 2

9 = x/2 + 3x

$9=\frac{x + 6x}{2}$

9 . 2 = 7x

18 = 7x

7x = 18

$x=\frac{18}{7}$

x = 2, 57