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{ y = 5 - 4x
{3x+6y=9
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{6x-2y-4
{x-8-7y
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y+4x=5/*(-6)3x+6y=9
-6y-24x=-306y+3x=9-----------------------
-21x=-21/:(-21)x=1y+4=5/-4y=1
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y+4x=5/*(-6)
3x+6y=9
-6y-24x=-30
6y+3x=9
-----------------------
-21x=-21/:(-21)
x=1
y+4=5/-4
y=1