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y in (-oo:+oo)
y/3+6/1 = -45 // + 45
y/3+6/1+45 = 0
y/3+6+45 = 0
1/3*y+51 = 0 // - 51
1/3*y = -51 // : 1/3
y = -51/1/3
y = -153
y = -153
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