$\left(9a-25b^2\right)^2$
$2\left(ax-3\right)=8x-b$
$36x^2+24+4$
$x+x+2v$
$x^2+16x-17$
$1.2\:x\:10^2$
$\left(5x^2.9\right)^2$
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