1) a³+1-a³= 1
2) x³+y³-x³-xy²= y³-xy²
3) m³-8+8= m³
4) c³+27-27= c³
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1) a³+1-a³= 1
2) x³+y³-x³-xy²= y³-xy²
3) m³-8+8= m³
4) c³+27-27= c³