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y in (-oo:+oo)
15 = (5/7)*y // - (5/7)*y
15-((5/7)*y) = 0
(-5/7)*y+15 = 0
15-5/7*y = 0 // - 15
-5/7*y = -15 // : -5/7
y = -15/(-5/7)
y = 21
y = 21
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