$\left(\left(a-c\right)-\left(a-b\right)\right)-\left(\left(b-c\right)-\left(a+c\right)\right)$
$\int\sec\left(2x^2\right)\cdot\tan\left(2x^2\right)\left(4x\right)dx$
$\left(4m-7\right)\left(7+4m\right)$
$log3\left(7x-2\right)=5$
$5x\:-y=-7$
$\int_{-3}^3-xdx$
$a+8-7a+9$
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