$6x-8y-5x+3y$
$4x^2-4ab+2b^2$
$x^2+14x\:+7$
$\left(-2\right)-\left(-4\right)+\left(-5\right)$
$6b-8b-3a-6b$
$-1+\left(-9\right)+33$
$\left(x^2+1\right)y'-xe^{2y}=0$
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