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y in (-oo:+oo)
13 = (-2/3)*y-3 // - (-2/3)*y-3
3-((-2/3)*y)+13 = 0
(2/3)*y+3+13 = 0
2/3*y+16 = 0 // - 16
2/3*y = -16 // : 2/3
y = -16/2/3
y = -24
y = -24
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