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X/3 = x/7-4 // - x/7-4
X/3-(x/7)+4 = 0
1/3*X-1/7*x+4 = 0 // - 1/3*X+4
-1/7*x = -(1/3*X+4) // : -1/7
x = (-(1/3*X+4))/(-1/7)
x = 7*(1/3*X+4)
x = 7*(1/3*X+4)
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