Question

Resolva as equações do 1° grau:

a)7x12=2x+4
b)5x-6=-3+18
c)10x+27=4x-21
d)20x-12=-10x+78

Answer 1

Resposta:

Explicação passo-a-passo:

7x - 12=2x + 4

7x - 2x  =  4 + 12

5x = 20

x = 20/5

x = 4

________

b)5x-6=-3+18

5x - 6 = - 3 + 18

5x = 15 + 6

x = 21/5

__________

c)10x+27=4x-21

10x + 27 = 4x - 21

10x - 4x = -21 - 27

14x = -48

x = -48/14    

x = -24/7

___________

d)20x-12=-10x+78

20x - 12 = 10x  + 78

20x - 10x = 78 - 12

10x = 66

x = 66/10

x = 6,6