$x+2x-x+3-3x$
$\left(b^{x-1}-13\right)\left(b^{x-1}-6\right)$
$\sqrt{36}-2^2$
$8x-1>6x+4$
$-5x+2y=9$
$3x+1=2x+3$
$70.09+4.089+12.349$
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