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5x+15y-7x-8y=6 5x+27y=0 (x2)
-2x+7y=6
7x-9y- 2 (x-18y) =0 -10x+35y=30
7x-9y- 2x+36y=0 10x+54y=0
5x+27y=0 ````````89y`=30```````````
y=30/89
x 324/178