2/3 + x/4 = 3/4 - x/3
x/4 + x/3 = 3/4 - 2/3
reducimos a comun denominador m.c.m = 12
(3x + 4x) / 12 = (9- 8 ) / 12
3x + 4x = 9-8
7x = 1
x = 1/7
============================================
2/3² = 2x - 8/7 + 2³
2/9 = 2x –8/7 + 8
2x = 2/9 +8/7 –8
2x = 14 + 72 – 504 / 63
126 x = -418
x = -418 / 126 = -209 / 63
==========================================
5/4 . 3 + x/4 = 2/3 - 2/3x
15 / 4 + x/4 = 2/3 –2/3 x
x/4 + 2x/3 = 2/3 – 15/4
5/3 x = -37/12
60x = -111
x = -111/60
