$-2\left(7\right)+4$
$7\left(6x+11\right)-5\left(8x+1\right)$
$\frac{\left(-2\right)^1}{2}$
$2a^3xy+8a^3x^2y-4a^3xy^2$
$1-4\cdot\left(-8\right)$
$f\left(x\right)=a\:in\left(2x-9\right)-x^2-4$
$x^2+2y\:+8x^2$
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