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1y-10y=-2/3-3-15+2/3
-9y=-18
y=2
2/3y - 10y + 15 + 7/6 - 2/3 = 1/3 - 1 - 3 / *6
4y - 60y + 90 + 7 - 4 = 2 - 6 - 18
4y - 60y = 2 - 6 - 18 - 90 - 7 + 4
-5ry = -117 / : - 54
y = 2 1/6