Seems easy, but...I want to be sure I am using the correct order

Thanks

C

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Michael F. | Mathematics TutorMathematics Tutor

3x-4(2x+5)=-16 +13x

1.remove parentheses 3x-8x-20=-16+13x

-5x-20=-16+13x 2. add 5x to both sides get -20=-16+18x

3. add 16 to both sides get -4=18x

4. divide by 18 get -4/18=-2/9=x

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Hanna W. | Hanna--Math, Economics, GeographyHanna--Math, Economics, Geography

3x-4(2x+5)=-16+13x

You have to first multiply 2x+5 by -4 before you can begin combining the other terms.

-4*(2x+5)=-8x-20 so...

3x-8x-20=-5x-20=-16+13x

then add 16 to both sides and add 5x to both sides

-5x+5x-20+16=-16+16+13x+5x

-20+16=13x+5x

-4=18x

divide both sides by 18

-4/18=18x/18=x

-2/9=x

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