Final Answer
$4\left(-a+3b\right)\left(3b+a\right)$
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Step-by-step Solution
Specify the solving method
1
Factor the polynomial $\left(-2a+6b\right)$ by it's greatest common factor (GCF): $2$
$2\left(-a+3b\right)\left(6b+2a\right)$
2
Factor the polynomial $\left(6b+2a\right)$ by it's greatest common factor (GCF): $2$
$4\left(-a+3b\right)\left(3b+a\right)$
Final Answer
$4\left(-a+3b\right)\left(3b+a\right)$