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y in (-oo:+oo)
(-1/3)*y-6 = -13 // + 13
(-1/3)*y-6+13 = 0
7-1/3*y = 0 // - 7
-1/3*y = -7 // : -1/3
y = -7/(-1/3)
y = 21
y = 21
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