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y in (-oo:+oo)
(-6/5)*y-(7/2) = 7*y-(2/5) // - 7*y-(2/5)
(-6/5)*y-(7*y)-(7/2)+2/5 = 0
(-6/5)*y-7*y-7/2+2/5 = 0
-41/5*y-31/10 = 0 // + 31/10
-41/5*y = 31/10 // : -41/5
y = 31/10/(-41/5)
y = -31/82
y = -31/82
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