You can put this solution on YOUR website! k+12 = 3(k-4)
k+12 = 3k-12
-2k = -24 divide both sides by -2 and remember -/- = +
k = 12 this is her present age
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Check:
12+12 = 3(12-4)
24 = 36-12 Correct
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Happy learning,
John