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x/2=7/5/2 (extremos con extremos y medios con medios)
x/2=7/10
5x=7
x=7/5
-2/1/4=x-5/x-2
-2/4=x-5/x-2
-1/2=x-5/x-2 Factor comun:2(x-2)
-x+2=2x-10
-3x=-12
x=4
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