My mother is 12 years more than twice my age. after 8 years she will be 20 years less than three times my my age and my mothers age

i have this equation:
2x+12+8=3x-20
2x+12-12+8-8=3x-20-20
2x+3x=-40
5x/5=-40/5
x=-8
need pls : (

Ernest is purchasing a $175,000 home with a 30-year mortgage. he will make a $15,000 down payment. use the table below to find his monthly pmi payment.

The center of the circumscribed circle lies on line segment and the longest side of the triangle is equal to the of the circle.

The means and mean absolute deviations of the individual times of members on two 4x400-meter relay track teams are shown in the table below. means and mean absolute deviations of individual times of members of 4x400-meter relay track teams team a team b mean 59.32 s 59.1 s mean absolute deviation 1.5 s 245 what percent of team b's mean absolute deviation is the difference in the means? 9% 15% 25% 65%