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5x=42-7
x=35/5
x=7
Ya que si haces 7 . 5 = 35
Y 35 + 7 = 42.
Escrito en ecuación:
x . 5 + 7 = 42
x . 5 = 42 - 7
x . 5 = 35
x = 35 : 5 =
x = 7