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y in (-oo:+oo)
y/3-7 <= -5 // + 5
y/3-7+5 <= 0
1/3*y-2 <= 0 // + 2
1/3*y <= 2 // : 1/3
y <= 2/1/3
y <= 6
y in (-oo:6>
(-oo:6>
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