Question

resolvas as equações a)2×-10=14 b)5×+12=42 c)3(x+2)=21 d)4×(×-5) + 3 = 7​

Answer 1

a) 2x - 10 = 14

2x = 14 + 10

2x = 24

x = 24/2

x = 12

b) 5x + 12 = 42

5x = 42 - 12

5x = 30

x = 30/5

x = 6

c) 3 (x + 2) = 21

(3x) + (3 * 2) = 21

3x + 6 = 21

3x = 21 - 6

3x = 15

x = 15/3

x = 5

d) 4 (x - 5) + 3 = 7

(4x) - (4 * 5) + 3 = 7

4x - 20 + 3 = 7

4x - 17 = 7

4x = 7 + 17

4x = 24

x = 24/4

x = 6

Espero ter ajudado.