$-\left|9-\left(-8\right)\right|+18-\left(5-7\right)$
$7a-8b-5a+2b$
$2\cdot\sin\left(x\right)\cdot\left(\sin\left(x\right)-1\right)+2\cdot\sin\left(x\right)=1$
$x-11x$
$\left(-3\right)-\left[\left(-9\right)-\left(-7\right)\right]$
$5x+10x^3-15x^2$
$3\cdot1$
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