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(3/4)*(x-d) = 12 // - 12
(3/4)*(x-d)-12 = 0
3/4*(x-d)-12 = 0
3/4*(x-d)-12 = 0
3/4*x-3/4*d-12 = 0
3/4*x-3/4*d-12 = 0
3/4*x-3/4*d-12 = 0 // + -3/4*d-12
3/4*x = -(-3/4*d-12) // : 3/4
x = (-(-3/4*d-12))/3/4
x = 4/3*(12-(-3/4*d))
x = 4/3*(12-(-3/4*d))
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