$-1^2+6\cdot1-8$
$f\left(x\right)=\sqrt[4]{x^7}$
$12+\left(4-\left(-15-\left(1+2\right)-10\right)\right)$
$-8\:sin\:x\:=\:-2\sqrt{5}$
$\left(9-z\right)\left(-9-z\right)$
$3a+6b\left(-9a+5b\right)$
$-39+4$
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