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(104-(2*x))/4 = 30-x // - 30-x
(104-(2*x))/4+x-30 = 0
(104-2*x)/4+x-30 = 0
(104-2*x)/4+(4*x)/4+(-30*4)/4 = 0
4*x-2*x-30*4+104 = 0
2*x-120+104 = 0
2*x-16 = 0
(2*x-16)/4 = 0
(2*x-16)/4 = 0 // * 4
2*x-16 = 0
2*x-16 = 0 // + 16
2*x = 16 // : 2
x = 16/2
x = 8
x = 8
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