$-5+3+2+9+-7$
$\left(3\right)^2+\left(2^2-12+4\right)^3\cdot2-5$
$\left(50-c\right)^2-10.5^2$
$\int\:-4x\:dx$
$\left(1-7\right)-\left(-2-+6\right)$
$-\left|3x+\left(-2x+5x\right)-9x\right|$
$x+3y+8+7x-2y-5$
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