$a^2+2a-7$
$\left(3+y\right)^7$
$-42x+4x^2+108$
$-1078\:.\:-1$
$4x^2-16+64$
$4\cdot\left(x^2+3x-1\right)-2x\cdot\left(3x+5\right)$
$5 ( 2 x + 1 ) ^ { 2 }$
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