$\sqrt{18z}+\sqrt{50z}$
$\left\{+40\right\}:\left(-8\right)-\left(-30\right):\left(+6\right)$
$3ac.2ac+ab$
$9a^2-30a$
$\log\left(86^{86^x}\right)$
$0.86^{11}$
$\left(2x-1\right)^2+2\left(1+2x\right)^2-2\left(2x+1\right)\left(2x-1\right)$
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