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(4*(2*x+3))/5-((x+1)/4) = 31/5 // - 31/5
(4*(2*x+3))/5-((x+1)/4)-(31/5) = 0
(4*(2*x+3))/5-((x+1)/4)-31/5 = 0
(4*(2*x+3))/5+(-1*(x+1))/4-31/5 = 0
(4^2*(2*x+3))/(4*5)+(-1*5*(x+1))/(4*5)+(-31*4)/(4*5) = 0
4^2*(2*x+3)-1*5*(x+1)-31*4 = 0
27*x-124+43 = 0
27*x-81 = 0
(27*x-81)/(4*5) = 0
(27*x-81)/(4*5) = 0 // * 4*5
27*x-81 = 0
27*x-81 = 0 // + 81
27*x = 81 // : 27
x = 81/27
x = 3
x = 3
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