Question

resolva as equações:a) 2(5+×)10=4 b) 5x+2(3+×)=-8 c) 8-3(2×-6)=12 d) 4(-×-1)=7(×+10)

Answer 1

5x + 2 (3 + x) = - 8

5x + 6 + 2x = - 8

7x = - 8 - 6

7x = - 14

x = - 2

8 - 3 (2x - 6) = 12

8 - 6x + 18 = 12

18 - 12 + 8 = 6x

14 = 6x

14/6 = x

4(- x - 1) = 7 (x + 10)

4x - 4 = 7x + 70

- 4 - 70 = 7x - 4x

- 74 = 3x

- 74/3 = x