$2.5x-1.9y+3.1x-0.6y$
$x+y.x^2-5x+2y$
$2+\left(-4-\:3\right)-\left(-4+\:2\right)$
$z^2+10z+100$
$y=-\frac{7}{5}x^2+x+\sqrt{x}$
$3-3\sin\left(0\right)$
$\left(3a-b\right)^2+3\left(a+b\right)^2$
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