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y = 8 - 2*x
If x=6 and y=8, then [ 5x + 8y ] = 5(6) + 8(8) = 30 + 64 = 94
9x-4 = 7x+8 9x-7x = 8+4 2x = 12 x = 6
x=y-8 z=x+12
X is 8 ...