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(4/5)*x-4 = (3/5)*(x-5) // - (3/5)*(x-5)
(4/5)*x-((3/5)*(x-5))-4 = 0
(-3/5)*(x-5)+(4/5)*x-4 = 0
(4*x)/5-3/5*(x-5)-4 = 0
(-3/5*5*(x-5))/5+(4*x)/5+(-4*5)/5 = 0
4*x-3/5*5*(x-5)-4*5 = 0
x-20+15 = 0
x-5 = 0
(x-5)/5 = 0
(x-5)/5 = 0 // * 5
x-5 = 0
x-5 = 0 // + 5
x = 5
x = 5
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