$3x^3-12x^4$
$7y^2+8y+1$
$x+4x+2$
$16\:x^2\:+\:7y^2\:-\:3\:-\left(25x^2+1-12y^2\right)$
$13-5\cdot9+8$
$\:-5-8+12+13+22$
$3\sin^2\left(x\right)+4\cos^2\left(x\right)=3+\cos^2\left(y\right)$
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