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If you have the equation y=3x2+6x then you can factor it down smaller like so:

y=3x(x+2)

This is possible because there is an 'x' in both parts of the equation. You can also do it backwards, because 3x*x=3x2 and 3x*2=6x.

If you are talking about a regular problem, such as 3+4(3-7) then you'd do the stuff in parentheses first. Remember the order: PEMDAS. Parentheses, Exponents, Multiply, Divide, Add, Subtract.

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