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y in (-oo:+oo)
13*y = 1/15-(3/14) // - 1/15-(3/14)
13*y-(1/15)+3/14 = 0
13*y-1/15+3/14 = 0
13*y+31/210 = 0 // - 31/210
13*y = -31/210 // : 13
y = -31/210/13
y = -31/2730
y = -31/2730
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