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X/7 = 920/9-((2*x)/9) // - 920/9-((2*x)/9)
X/7+(2*x)/9-(920/9) = 0
X/7+(2*x)/9-920/9 = 0
1/7*X+2/9*x-920/9 = 0 // - 1/7*X-920/9
2/9*x = -(1/7*X-920/9) // : 2/9
x = (-(1/7*X-920/9))/2/9
x = 9/2*(920/9-(1/7*X))
x = 9/2*(920/9-(1/7*X))
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