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y in (-oo:+oo)
(1/6)*y-15+25 = -3 // + 3
(1/6)*y-15+3+25 = 0
1/6*y+13 = 0 // - 13
1/6*y = -13 // : 1/6
y = -13/1/6
y = -78
y = -78
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