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{2x+4y=8
{-12x - 4y= - 20
{2x + 4y = 8
-10x= - 12 / : (-10)
x = 1.2
{-x+3y=4 / * (-1)
{2x+3y=1
{x-3y=-4 => -3 - 3y =-4 -3+4=3y 1= 3y y= 0.(3)
{2x+3y=1
x= - 3