$12\:+\:3\:x\:4\:-\left(-2\right)$
$12y^2-29y+15$
$9m+12\cdot9m-12$
$f\left(t\right)=\left(t^2+4t+8\right)\left(3t^2+4\right)$
$\left(3x^2+6x-5\right)+\left(-x^2+4\right)$
$\:16x^2\:-\:49\:b.\:100x^{2\:}-\:100x\:+\:25\:$
$-3-\left(2-3\left(1+4-10\right)-3\right)+2\left(7-5\right)$
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