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2014-07-13T10:30:26-03:00
5x+4 = 4x + 20
5x - 4x= 20 -4
x= 16

Raiz quadrada de 16 = 4.
1 5 1
2014-07-13T10:32:53-03:00
5x + 4 = 4x + 20
5x - 4x = 20 - 4
x = 16

√ x = 16
√ 16 = 4
1 5 1