$\left(a+b\right)\left(a-b\right)-\left(a-b\right)^2$
$x\:^3-2x$
$\left(2x+3y\right)\left(4x-5y\right)$
$t=4s+4.34$
$100x^{10}60a^4x^5y^6+9a^8y^{12}$
$162\cdot3$
$-12+\left(+10\right)-7+11-\left(-30\right)+\left(-15\right)$
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