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4x -6y = 10
4(k-1) - 6(2k+3) = 10
4k-4 - 12k - 18 = 10
-8k = 10 + 22
-8k = 32
k = 32/(-8)
k = -4
4(k-1)-6(k+3)=10
4k-4-12k-18=10
-8k-22=10
-8k=32
k=-4