$a-4\left(2a-7\right)=3\left(a+6\right)$
$\left(2\right)\left(2\right)\left(4\right)\left(-2\right)$
$-34+-25+-9+488$
$5x^2\:y^4-10x^5\:y^6+25x^3\:y$
$11m-13n-5c-9m-8n-9c-16m-18n-20c$
$-\left(-30\right)+\left(-50\right)-\left(+20\right)+\left(+10\right)$
$9x^2+18x+10$
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