Explicación paso a paso:
20 +20 -x = 94
-x = 94 -20-20
x = 94-40/-1
x = -54
20 + 20 -(-54) = 94
40+54 = 94
94 = 94
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Explicación paso a paso:
20 +20 -x = 94
-x = 94 -20-20
x = 94-40/-1
x = -54
20 + 20 -(-54) = 94
40+54 = 94
94 = 94