The first option,
both have to be negative, because they were originally both part of the one fraction, which was all negative.
X + 12 = 20
x + 12 -12 = 20 -12
x = 8
2x + 4 = 3(x - 2) + 1
2x + 4 = 3x - 6 + 1
2x + 4 = 3x - 5
9 = x
So x = 9
Kaylen has $12.63 left.
$14.87 + $7.76 = $22.63
$22.63 - $10.00 = $12.63