K=?时 代数式3分之K-8的与0.25K+5的值相等若代数式4分之X+5的值是代数式X-8分之3的值的负倒数,则X=?

Question

K=?时 代数式3分之K-8的与0.25K+5的值相等
若代数式4分之X+5的值是代数式X-8分之3的值的负倒数,则X=?

Answer 1

k=156:
k/3 - 8 = 0.25k + 5
k-24 = 0.75k+15
0.25k = 39
k = 156
x=-4 :
x/4 + 5 = -(x-8)/3
3x+60 = -4(x-8)
7x = -28
x=-4