Resposta :

romulopossatte
a)10x= +18-20+12
x=+30-20/10
x=10/10
x=1
b)13x+7x=12+23+45
x=80/20
x=4
a)
10x - 12 = + 18 - 20
10x = 18 - 20 + 12
10x = - 2 + 12
10x = 10
x = 10 : 10
x = 1

b) 13x - 23 - 45 = - 7x + 12
13x + 7x = 12 + 23 + 45
20x = 8-
x = 80 : 20
x = 4

Outras perguntas