$12.6+.09$
$4\left(\infty\right)+1$
$a-2ab\cdot a-2ab$
$4b^2-36$
$\left(+5\right)x\left(-6\right)+\left(-6\right)x\left(-4\right)-\left(-3\right)x\left(+8\right)$
$2^2x-x-10$
$4x^2-2y+4x-33=0$
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