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b

$20$ and $12$ are both even numbers, so a $2$ can be factored out from both of them. We can also identify a $x$-term.

Now, we can continue factoring out other factors. $10$ and $6$ are also even numbers, thus, we'll factor out an additional $2.$

$2x(10x+6)$

SplitIntoFactorsSplit into factors

$2x(2⋅5x+2⋅3)$

FactorOutFactor out $2$

$2x⋅2(5x+3)$

MultiplyMultiply

$4x(5x+3)$

c

The terms in the expression all have the factor $x.$

None of the terms in the parenthesis have any common factors, so there are nor more common factors here.