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y in (-oo:+oo)
(1/6)*(y-42)-15 = -3 // + 3
(1/6)*(y-42)-15+3 = 0
1/6*(y-42)-15+3 = 0
1/6*(y-42)-15+3 = 0
1/6*y-22+3 = 0
1/6*y-19 = 0
1/6*y-19 = 0
1/6*y-19 = 0 // + 19
1/6*y = 19 // : 1/6
y = 19/1/6
y = 114
y = 114
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