$\left(a-b+6\right)\left(a-b-6\right)-\left(a-b\right)^2$
$5-\left(t^2-17\right)\:=\:-5t^2+67$
$x^2+4x-7=0$
$2ax-3bx+2ay-3by$
$-103+424$
$42,382\cdot7,9$
$6d+3d-2d$
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