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y in (-oo:+oo)
y/7-(5/2)-7 = 0
y/7-5/2-7 = 0
1/7*y-19/2 = 0 // + 19/2
1/7*y = 19/2 // : 1/7
y = 19/2/1/7
y = 133/2
y = 133/2
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