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2x - 8 = x - 4
2x - x = -4 +8
x = 4
b) Calculas la raíz y la fracción:
2 + x/2 = 4/3
Haces el mcm(2,3) = 6
12 + 3x = 8
3x = 8 - 12
x = - 4/3