Question

RESOLVA AS EQUAÇÕES 1 GRAU a)2X+4=16 b)4X-12=2X=+2 c)2X+1=4X-7 d)7(X+1)=21

Answer 1

a) 10 b) 5 c) -3 d) 3

Answer 2

A)
2x + 4 = 16
2x= 16-4
2x = 12
x = 12/2
x = 6 

B) 
4x-12=2x+2
2x = +12 + 2
2x = 14
x = 14/2
x = 7

C)
2X + 1 = 4X-7
1+7 = 2X
8 = 2x
x = 8/2
x = 4

D)
7 (X+1) = 21
Faz a distributiva 
7X + 7 = 21
7x = 28
X = 28/7
X = 4