In 15 years, a child's age will be 9 years less than four times her current age. Find her current age. x = child's age now x + 15 = child's age in 15 years x + 15 = 4x  9 {in 15 years she will be 9 less than 4 times her age now} 15 = 3x  9 {subtracted x from each side} 24 = 3x {added 9 to each side} x = 8 {divided each side by 3} her current age is 8  Algebra House
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