$\left(x^2+7x+5\right)+3x^2+21x+17$
$x^2+225+15x^2$
$\left(42-25\right)-3\cdot\left(5\cdot\left(16-3\cdot4\right)\right)+7$
$-63mas\:-20$
$4x^2200x+625$
$\left(a^2+3b-6\right)\left(3a^2-5b+8\right)$
$-5+10\left(-3\right)$
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