$-2\left(-3x+\frac{1}{2}\right)-4x$
$67.5+78.9+.83+567.90$
$\:8x\:+\:4\:-\:x\:\cdot$
$\sqrt{9}+5^2$
$2\left(-1\right)^3\left(3\right)-3\left(-1\right)^2\left(3\right)^3$
$a^2+16a+15$
$x^4-4x^3+21x^2$
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