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X/2-(x/7)-1 = 4 // - 4
X/2-(x/7)-4-1 = 0
1/2*X-1/7*x-5 = 0 // - 1/2*X-5
-1/7*x = -(1/2*X-5) // : -1/7
x = (-(1/2*X-5))/(-1/7)
x = -7*(5-(1/2*X))
x = -7*(5-(1/2*X))
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