$\left(mn^7\right)^3$
$25x^2-50x^2+11x^2+4x^2$
$8\left(-1-3n\right)+4n=-148$
$-27xy+18xy-35xy+19xy-14xy$
$20+90+51zy$
$7,5-075$
$a+8-7a+9$
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