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