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(5*(x-30))/4+(4*(2*x+30))/3 = 39 // - 39
(5*(x-30))/4+(4*(2*x+30))/3-39 = 0
(3*5*(x-30))/(3*4)+(4^2*(2*x+30))/(3*4)+(-39*3*4)/(3*4) = 0
3*5*(x-30)+4^2*(2*x+30)-39*3*4 = 0
47*x-468+30 = 0
47*x-438 = 0
(47*x-438)/(3*4) = 0
(47*x-438)/(3*4) = 0 // * 3*4
47*x-438 = 0
47*x-438 = 0 // + 438
47*x = 438 // : 47
x = 438/47
x = 438/47
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