Question

Resolva as equações:
A)x+7=20
B)2-1=-10
C)3-x=15
D)x=12
2
E)x-1=12+11
F)5x-5=2 x+10
G)3x+5=14

Answer 1

A)x+7=20
x = 20 - 7
x = 13

B)2-1=-10
1 = - 10 ----> Igualdade falsa

C)3-x=15
- x = 15 - 3
- x = 12 (-1)
x = - 12

D)x=12/2
x • 2 = 12
2x = 12
x = 12/2
x= 6

E)x-1=12+11
x = 12 + 11 + 1
x = 23 + 1
x = 24

F)5x-5=2x+10
5x - 2x = 10 + 5
3x = 15
x = 15/3
x = 5

G)3x+5=14
3x = 14 - 5
3x = 9
x = 9/3
x = 3