$$5 ^ { 0 } + 6 ^ { 0 } - 7 ^ { 0 } - 9 ^ { 0 }$$
$0$
$$1+6^{0}-7^{0}-9^{0}$$
$$1+1-7^{0}-9^{0}$$
$$2-7^{0}-9^{0}$$
$$2-1-9^{0}$$
$$1-9^{0}$$
$$1-1$$
$$0$$
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