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2y = 7 - 15
2y = (-8)
y = (-4)
B.9x-8=13x-28
9x - 13x = 8 - 28
-4x = -20
x = 5
C.4x-5=8x+23
4x - 8x = 5 + 23
-4x = 28
x = (-7)