$-7x^2\:para\:x=-1$
$\left(5a^7\right)^0$
$2 x - 10 x ^ { 2 } + 3 ( 5 x ^ { 2 } - 3 x )$
$4x^5-4x^4-5x^3+x^2+x$
$2y^2+10y+4y^2+x^2$
$\left|3-\left(-7\right)\right|$
$5^4\cdot3^9$
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