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2RA+3AU+6UL=295 ...........E2
de la ecuacion 1 sacamos las siguientes relaciones:
RA/4 = AU/5 ......donde AU=5RA/4
RA/4 = UL/6........donde UL=6RA/4
reemplazando en E2
2RA+3*5RA/4+6*6RA/4=295
(8RA+15RA+36RA)/4=295
59RA=1180
RA=20