Question

Ze wzoru M= (3w+k)*l/3 wyznacz k

Answer 1

M=(3w+k)*l/3            /*3
3M=(3w+k)*l                 / l 
3M/l = 3w+k 
3M/l - 3w=k 

Answer 2

M = (3*w + k)*l/3          |*3
3*M = (3*w + k)*I
3*M = 3*w*l + k*l
k*l = 3*M - 3*w*l
k = 3*(M - w*l)/l  lub 3*(M/l - w)