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X/3 = 28-(2*x) // - 28-(2*x)
X/3+2*x-28 = 0
1/3*X+2*x-28 = 0 // - 1/3*X-28
2*x = -(1/3*X-28) // : 2
x = (-(1/3*X-28))/2
x = (28-(1/3*X))/2
x = (28-(1/3*X))/2
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