Question

Calcule o termo desconhecido.
a)3-x=11. b) - 9 - x = 3
c)- x + 3 = 8

Answer 1

a) -x = 11 - 3
x = -8

b) -x = 3 + 9
x = -12

c) -x = 8 - 3
x = -5

Answer 2

a) 3-x=11
-x=11-3
-x=7 .(-1)
x=-7
b) -9-x=3
-x=3+9
-x=12 .(-1)
x=-12
c) -x+3=8
-x=8-3
-x=5 .(-1)
x=-5