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25 = 2x + 5
-2x = 5 - 25
-2x = -20
x = (-20)/(-2)
x = 20/2
x = 10 → respuesta
2x = 25 - 5 el signo "+" se cambia y se vuelve un -
2x = 20
x = 20 ÷ 2
x = 10
25 = 2(10) + 5
25 = 25