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a) {x+4>05x−25≤0\begin{cases} x+4>0 \\ 5x-25 \leq 0 \end{cases}{x+4>05x−25≤0
b) {2x−1≥5−x−3<0\begin{cases} 2x-1 \geq 5 \\ -x-3<0 \end{cases}{2x−1≥5−x−3<0
c) {2x+8>0x−9≤0\begin{cases} 2x + 8>0 \\ x-9\leq 0 \end{cases}{2x+8>0x−9≤0
d) {−4x>x+152(x+9)<3−x\begin{cases} -4x > x+15 \\ 2(x+9)<3-x \end{cases}{−4x>x+152(x+9)<3−x
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