$0-7+\left(-4-3+2\right)-\left(5-2-8\right)$
$8\cdot2+-4\cdot2$
$-x^2-4x\le2x^2+5x$
$2\cdot7\cdot5$
$20 x ^ { 2 } - 8 x$
$-10\left(9+-7x\right)+-6$
$5x^2+6x-4\cdot\left(3x-2\right)$
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