$2\sqrt{x}+1=x+1$
$6r\:+\:4r\:-r$
$8x^2+6xy+9y^2-3x^2+8y^2$
$\left(5ab\right)\left(-2a\right)\left(2b^2\right)\left(-2x\right)$
$\sqrt{81-\left(-5\right)}$
$17-4+2-\left(-1\right)+3$
$24a^2b+4abc$
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