$3x-7x+5x+4y$
$1+x-x^2\:yz-x^3\:yz$
$2\left(x+2\right)+3\left(x-1\right)=11$
$-118-15$
$y'=3x^2+3x+10$
$25 = 7 + r$
$6\left(18x-25\right)-7$
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