Question

Resolva as expressões abaixo: a) 3x + 5 = 38 .................................................................................................. b) 7x = 6x + 21 .......................................................................................... c) x + 5 = 20 - 4x ........................................................................................... d) 5x - 4x + 10 = -7x + 50 *
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Answer 1

Resposta:

a) 3x+5=38

3x= 38-5

3x= 33

x= 33/ 3

x= 11

b) 7x=6x+21

7x-6x= 21

x= 21

c) x+ 5= 20-4x

x+4x= 20-5

5x= 15

x=15/5

x= 3

d) 5x-4x +10= -7x+50

5x-4x+7x= 50-10

8x= 40

x= 40/8

x= 5