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(x+21+27+28)/4 = 25 // - 25
(x+21+27+28)/4-25 = 0
(x+76)/4-25 = 0
(x+76)/4+(-25*4)/4 = 0
x-25*4+76 = 0
x-24 = 0
(x-24)/4 = 0
(x-24)/4 = 0 // * 4
x-24 = 0
x-24 = 0 // + 24
x = 24
x = 24
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