Separate $90 into two parts so that the second part is $30 less than twice the first part. x = first part 2x  30 = second part {second part is 30 less than twice first} x + 2x  30 = 90 {the two parts add together to equal 90} 3x  30 = 90 {combined like terms} 3x = 120 {added 30 to each side} x = 40 {divided each side by 3} 2x  30 = 50 {substituted 40, in for x, into 2x  30} $40 and $50 are the two parts  Algebra House
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