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b/3-((7*x)/12) = 2/3 // - 2/3
b/3-((7*x)/12)-(2/3) = 0
b/3+(-7/12)*x-2/3 = 0
1/3*b-7/12*x-2/3 = 0 // - 1/3*b-2/3
-7/12*x = -(1/3*b-2/3) // : -7/12
x = (-(1/3*b-2/3))/(-7/12)
x = -12/7*(2/3-(1/3*b))
x = -12/7*(2/3-(1/3*b))
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