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2x + 1/3 = 4x/7
multiplicamos todo por 21:
42x + 7 = 12x
42x - 12x = -7
30x = -7
x = -7/30
(1/5)x - 7 = -(3/2)x - 8multiplicamos todo por 10:
2x - 10 = -15x - 80
2x + 15x = -80 +10
17x = -70
x = -70/17