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y in (-oo:+oo)
-((2/7)*y)-8/3 = -5/2 // + -5/2
-((2/7)*y)-8/3-(-5/2) = 0
(-2/7)*y-8/3+5/2 = 0
-2/7*y-1/6 = 0 // + 1/6
-2/7*y = 1/6 // : -2/7
y = 1/6/(-2/7)
y = -7/12
y = -7/12
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