3−4t≤8+t−5≤5tt≥−1∴t∈[−1,∞[3-4t\leq 8+t\\ -5\leq5t\\ t\geq-1\\ \therefore t \in [-1,\infin[3−4t≤8+t−5≤5tt≥−1∴t∈[−1,∞[
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