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(1/3)*(b+x) = m // - m
(1/3)*(b+x)-m = 0
1/3*(b+x)-m = 0
1/3*(b+x)-m = 0
1/3*b-m+1/3*x = 0
1/3*b-m+1/3*x = 0
1/3*b-m+1/3*x = 0 // - 1/3*b-m
1/3*x = -(1/3*b-m) // : 1/3
x = (-(1/3*b-m))/1/3
x = 3*(m-(1/3*b))
x = 3*(m-(1/3*b))
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