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3R+10A=10
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-8R-10A= -16
3R+10A= 10
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-5R= -6
R= 6/5
Ahora hallamos A
4R+5A=8
4(6/5)+5A=8
24/5 - 8= -5A
24-40/5 = -5A
-16/5= -5A
16/5 ÷ 5 = A
16/25=A
Ahora comprobamos
3R+10A=10
3(6/5)+10(16/25)=10
18/5+32/5 = 10
50/5 =10
10 = 10