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y in (-oo:+oo)
(-2/3)*y-(1/5) = 8.5 // - 8.5
(-2/3)*y-(1/5)-8.5 = 0
(-2/3)*y-1/5-8.5 = 0
-2/3*y-8.7 = 0 // + 8.7
-2/3*y = 8.7 // : -2/3
y = 8.7/(-2/3)
y = -13.04999993
y = -13.04999993
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