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y in (-oo:+oo)
(1/5)*y-7 = (2/3)*y // - (2/3)*y
(1/5)*y-((2/3)*y)-7 = 0
(1/5)*y+(-2/3)*y-7 = 0
-7/15*y-7 = 0 // + 7
-7/15*y = 7 // : -7/15
y = 7/(-7/15)
y = -15
y = -15
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