Question

Resolva as equações com cálculo:

A) x + 7 = 0

B) 7x + 1 - 5x = 9

C) 21x + 1 = 11z + 6

Answer 1

A) x + 7 = 0

x= 0 - 7

x= - 7

B) 7x + 1 - 5x = 9

2x + 1 = 9

2x = 9 - 1

2x= 8

x= 8/2

x= 4

C) 21x + 1 = 11x + 6

21x - 11x = 6 - 1

10x= 5

x= 5/10 (÷5)

x= 1/2