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