No matter what i do i can't seem to find a reasonable answer for this problem! I've done everything I can think of.

Block m1( 7 kg ), lies on an incline plane with a coefficient of kinetic friction of 0.15. m1 is connected to mass m2 by a massless rope passing over a pulley. As m2 moves down, determine the acceleration of m1 up the incline, given θ = 28 and m1 = m2.

total mass = 14 kg

total force down = 7 g - .15 *7 g cos 28

a = total force/14