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21X=25-4
21X= 21
X= 21/21
X= 1
4X+1=5
4X=5-1
4X= 4
X=4/4
X=1
21x = 25 - 4
21x = 21
x = 21/21
x = 1
Solución :
x = 1
------------------------------
4x + 1 = 5
4x = 5 - 1
4x = 4
x = 4/4
x = 1
Solución :
x = 1