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X/7 = 10-(x/3) // - 10-(x/3)
X/7+x/3-10 = 0
1/7*X+1/3*x-10 = 0 // - 1/7*X-10
1/3*x = -(1/7*X-10) // : 1/3
x = (-(1/7*X-10))/1/3
x = 3*(10-(1/7*X))
x = 3*(10-(1/7*X))
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