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63)
9x/4 - 6 = 2x/3 + 1/3
27x - 72 = 8x + 4
27x - 8x = 4 + 72
19x = 76
x = 76/19
x = 4 → Solución
65)
3x/5 - 7 = 2x/6 + 1
18x - 210 = 10x + 30
18x - 10x = 30 + 210
8x = 240
x = 240/8
x = 30 → Solución