$2\left[\left(30-2x\right)\left(x\right)\right]$
$9x^2-4x+2x^2+x+10$
$e^{-2y}dy=e^{3x}dx$
$2c+9-3c+2c$
$8^2+5y$
$6x^2+13x+5x^2$
$-55\:-\:\left(-55\right)$
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