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(b+x)/4 = c // - c
(b+x)/4-c = 0
(b+x)/4+(4*(-c))/4 = 0
b+4*(-c)+x = 0
b-4*c+x = 0
(b-4*c+x)/4 = 0
(b-4*c+x)/4 = 0 // * 4
b-4*c+x = 0
b-4*c+x = 0 // - b-4*c
x = -(b-4*c)
x = -(b-4*c)
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