$2x-3x$
$5z-4z$
$\sqrt{h+5}-2.\sqrt{h+5}+2$
$2\left(5.5x.20\right)$
$5^4\cdot5^x$
$6t+4t^2-52^2+8t$
$\left(sen\:3\:-\:cos3\right)^2\:+\:\left(sen\:3+cos3\right)^2=\:2$
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