$6c^2t-7ct^2$
$8k^2+7k$
$2,5+0$
$\left(-\frac{1}{3}+\frac{5}{3}y\right)^2$
$12.8+\left(-5\right).3.\left(-8\right)+5$
$2\pi\:+2\pi\:$
$-400-\left(-64\right)$
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