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X/7-10 = 2*x-9 // - 2*x-9
X/7-(2*x)-10+9 = 0
X/7-2*x-10+9 = 0
1/7*X-2*x-1 = 0 // - 1/7*X-1
-2*x = -(1/7*X-1) // : -2
x = (-(1/7*X-1))/(-2)
x = (1-(1/7*X))/(-2)
x = (1-(1/7*X))/(-2)
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