Calcula el valor de x por la propiedad de las
igualdades.
a) x – 18 = 20
c) 4x + 5 + x = 85
igualdades.
a) x – 18 = 20
c) 4x + 5 + x = 85
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1. x=20+18
x=38
2. 4x+x=85-5
5x=80
x=80/5
x=16