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8 + -8 + -3y = 17 + -8 7 + -7 + -4y = 8 + -7
8 + -8 = 0 7 + -7 = 0
0 + -3y = 17 + -8 -3y = 17 + -8 0 + -4y = 8 + -8 -4y = 8 + -8
17 + -8 = 9 8+-7= 1
-3y = 9 -4y=1
y = -3 y=1/-4