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y in (-oo:+oo)
y/3+7.1 = -12.1 // + 12.1
y/3+7.1+12.1 = 0
1/3*y+19.2 = 0 // - 19.2
1/3*y = -19.2 // : 1/3
y = -19.2/1/3
y = -57.60000058
y = -57.60000058
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