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What's the value of x?

r = kx - 4x

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Jonathan C. | Enthusiastic and Flexible Tutor Who Loves Seeing Others Learn.Enthusiastic and Flexible Tutor Who Love...
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x depends on what you choose k and r to be.  First, factor the right side, then divide:
 
    r = kx - 4x
    r = x(k-4)
    r / (k-4) = x
 
Make sure in your solution to include that k is not ever equal to 4.  This causes a disaster.