Why did Karl Marx blame capitalism , and what did he propose to change it ?

Karl Marx blamed capitalism mainly because as an economic system, it promotes and reproduces income and wealth inequality. The reason for this is that in capitalism, the means of production such as factories and equipment, are owned by private individuals, who pay the workers who operate those means of production a wage that is only enough for survival, while appropriating the rest of the income that their work generates.

Karl Marx proposed a different system, known as socialism, in which the means of production are owned by the workers, not by the capitalists.

the perimeter of a triangle is 69 cm. side a is 5 cm shorter than side b. side c is twice as long as side a. find the length of each side. i need to know how to do it in 2 equations.  

equations:

a = b-5

c = 2a

a + b + c = 69