$-4-3+5-2-7+3$
$10x\left(-2\right)x\left(-5\right)x\left(-2\right)$
$2\cdot0.1505\:+\:0.301$
$-45-\left(-39\right)$
$x^3-x^2y-3xy^2$
$\left(a+7\right)\left(a-5\right)$
$3x^2\left(-5xy^2\right)$
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