Question 299269
In 30 years, Sue will be 4 times as old as she is now. How old is she is now? 
I used the equation 4x = 30 - x.....but I don't think that is correct.
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She's x years old now.  In 30 years, she'll be x+30.
x + 30 = 4x
3x = 30
x = 10