Question

1) Determine o valor de X:

a) 21x-17=109
b) 2X + 100 = 9X + 72
c) 5X + 25 - 5 = - 7x

Answer 1

Resposta:

a) 21x-17=109

21x=109+17

21x=126

x=126/21

x=6

b) 2X + 100 = 9X + 72

2x-9x=72-100

-7x=-28

x=-28/-7

x=4

c) 5X + 25 - 5 = - 7x

5x+7x= -25+5

12x= -20

x= -20/12