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y in (-oo:+oo)
-((6/5)*y)-21 = -57 // + 57
57-((6/5)*y)-21 = 0
(-6/5)*y-21+57 = 0
36-6/5*y = 0 // - 36
-6/5*y = -36 // : -6/5
y = -36/(-6/5)
y = 30
y = 30
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