2. Calcule o valor de x.
a) 5x + 5 = 20
b) 2x + 3 = 13
c) 10x + 10 = 40
d) 2x - 3 = 17
a) 5x + 5 = 20
b) 2x + 3 = 13
c) 10x + 10 = 40
d) 2x - 3 = 17
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Resposta:
A) 5×= -5+20
5×= 15
X= 15
5
X= 3
B) 2X= -3+13
2x= 10
X= 10
2
X= 5
C) 10X= -10+40
10X= 30
X= 30
10
X= 3
D) 2X= 3+17
2X= 20
X= 20
2
X= 10