$+28-1$
$\left(7\cdot5\right)^2$
$x^2+bx+\frac{b}{2}$
$\log_x\left(\frac{1}{16}\right)=-2$
$xz-12=0$
$-3\left(5x-\left(-2\right)\right)+\left(4x-2\right)$
$\lim_{x\to a}-2\left(a\right)+3\left(a\right)$
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