$5+9\left(1\right)+2^2$
$1+-10\cdot8$
$5x+12,con\:x=3$
$-9w+5-8w-4$
$\left(3x^2-2xy\right)dx+\left(4y^3-x^2-3\right)dy=0$
$\left(+10\right)-\left(+8\right)-\left(+4\right)-\left(-7\right)$
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