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20x + 7 - 2 = 15x + 3
20x + 5 = 15x + 3
20x - 15x = 3 - 5
5x = - 2
x = - 2/5
Respuesta.
x = - 2/5
5x +7 - 2 = 3
5x - 2 = -4
5x = -2
x = -2/5