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6x+9y=9 x4
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24x-18y=90
24x+36y=36
------------------ -
-54y=54
y= -1
4x-3y=15
4x-3(-1)=15
4x+3=15
4x = 15-3 = 12
x= 12 : 4
×= 3
Hp{3,-1)