$-5\left(b+6\right)+7\left(b-4\right)$
$7y^{2\:}-4x-7x+2-2x-3-7y^2$
$y'=\sin x\:+e^x-5x$
$\left(x+\sqrt{5}\right)^2$
$49.63\cdot2.14$
$-3-\left(-4\right)\cdot7$
$\frac{\left(x^2+0+12\right)}{\left(x-2\right)}$
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