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If i have 3x- 3x do i get x or does it cancel out

algibra 9th grade

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Mark V. | Expert Tutor for Spanish, Math, English, Writing, SAT, and ACTExpert Tutor for Spanish, Math, English,...
4.9 4.9 (540 lesson ratings) (540)
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Or, if you wish, think of the variable as standing for a thing, such as "apples."

3apples - 3 apples = 0apples, or just plain 0 (zero).

Julia W. | Algebra I Made BetterAlgebra I Made Better
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--any number minus itself is 0.

Steven T. | Math and PhysicsMath and Physics
5.0 5.0 (3 lesson ratings) (3)
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It cancels out. The best way to see this is by factoring out the x giving you x(3-3) = x(0). Anything times zero is zero, so it cancels out.

Comments

Good thinking!  When you have something such as 0=14, it's a false statement, which means there is "no solution," or "null set," if you use that notation.