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x+y=85
1)y+36=2x-20.......dato
y+36=2x-20
y=2x-20-36
y=2x-56....resultado de "y"
REEMPLAZAS.....
2) x+"y"=85
x+"(2x-56)"=85
x+2x-56=85
3x=85+56
3x=141
x=47.....resultado final de "x"
....... y=85-x
.........y=38.......resultado final de "y"