$-8\:5.\:\:5$
$\:5x\:+\:x$
$50a-9a$
$x^2+3x+3x-x^2$
$f\left(x\right)=\left(2x+2\right)\left(x^2-2\right)^2$
$3m-6+m^2-5m+1$
$3\cdot2^4-5\cdot2^2-1$
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