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(1/7)*(x+9) = 8 // - 8
(1/7)*(x+9)-8 = 0
1/7*(x+9)-8 = 0
1/7*(x+9)-8 = 0
1/7*x-47/7 = 0
1/7*x-47/7 = 0
1/7*x-47/7 = 0 // + 47/7
1/7*x = 47/7 // : 1/7
x = 47/7/1/7
x = 47
x = 47
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