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(x+2y=20)x2==>2x+4y=40
_____________________-
==> -y= -14
y= 14
y=14==> 2x+3y=6
===> 2x+3(14)=6
====> 2x+42=6
====> 2x=6-42
===> 2x= -36
====> x= -36/2
=====> x=-18
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