$\left(-18\right)-\left(-31\right)-\left(-3\right)-\left(-16\right)$
$t^2-14t+49$
$d=c+10$
$x^2y^2+2x^2y+y^2$
$\sqrt[7]{x^5}$
$\left(9x-3y-3\right)^3$
$\frac{4x+4}{x^3+6x^25x}$
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