Hola
7x-15=20
7x=20+15
7x=35
x=35÷7
x=5
comprobamos =
5+5+5+5+5+5+5-15=
35 - 15 = 20
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Hola
7x-15=20
7x=20+15
7x=35
x=35÷7
x=5
comprobamos =
5+5+5+5+5+5+5-15=
35 - 15 = 20