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t in (-oo:+oo)
4*(2*t+9) = -28 // + 28
4*(2*t+9)+28 = 0
4*(2*t+9)+28 = 0
8*t+64 = 0
8*t+64 = 0
8*t+64 = 0 // - 64
8*t = -64 // : 8
t = -64/8
t = -8
t = -8
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