$b+a+c-a-c$
$-2x+3+x-5$
$5\left(6-2\left(3-\left(4+5+2\right)+4\right)-1\right)$
$2\log\left(x-1\right)-4$
$x ^ { 6 } - 64 x ^ { 6 } y ^ { 6 }$
$\left(a+b^{2n+1}\right)^2$
$\lim_{n\to\infty}\:\left(-2\right)^n-1$
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