Kenneth S. answered 08/17/17
Tutor
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Expert Help in Algebra/Trig/(Pre)calculus to Guarantee Success in 2018
Strictly speaking, you don't SOLVE*
3x3y2-3x2y2+3xy2 ...you can factor it, however.
Inspect it to find GCF. 3 is a common factor; x is also; y2 is too. Put them all together to have the GCF.
* you solve equations and inequalities.