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(1/8)*(x+4) = (1/12)*(7-x) // - (1/12)*(7-x)
(1/8)*(x+4)-((1/12)*(7-x)) = 0
(1/8)*(x+4)+(-1/12)*(7-x) = 0
1/8*(x+4)-1/12*(7-x) = 0
1/8*(x+4)-1/12*(7-x) = 0
5/24*x-1/12 = 0
5/24*x-1/12 = 0
5/24*x-1/12 = 0 // + 1/12
5/24*x = 1/12 // : 5/24
x = 1/12/5/24
x = 2/5
x = 2/5
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