$\int_{-1}^2\left(x^2-1\right)-\left(x^2-2x-5\right)dx$
$4+a=13$
$3x^2+24x-60$
$81b^2-18bc+c^2$
$4x^4-5x^3-11x^2+15x-3$
$12+\left(-12\right)+\left[90\right]^2$
$12x^2+14x-2=8$
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