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(8*x-(4*x)-3)/5 = 12 // - 12
(8*x-(4*x)-3)/5-12 = 0
(8*x-4*x-3)/5-12 = 0
(4*x-3)/5-12 = 0
(4*x-3)/5+(-12*5)/5 = 0
4*x-12*5-3 = 0
4*x-63 = 0
(4*x-63)/5 = 0
(4*x-63)/5 = 0 // * 5
4*x-63 = 0
4*x-63 = 0 // + 63
4*x = 63 // : 4
x = 63/4
x = 63/4
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