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X/4-x = x/8-(7/2) // - x/8-(7/2)
X/4-x-(x/8)+7/2 = 0
1/4*X-9/8*x+7/2 = 0 // - 1/4*X+7/2
-9/8*x = -(1/4*X+7/2) // : -9/8
x = (-(1/4*X+7/2))/(-9/8)
x = 8/9*(1/4*X+7/2)
x = 8/9*(1/4*X+7/2)
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