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(9*x-29)/8 = -7 // + 7
(9*x-29)/8+7 = 0
(9*x-29)/8+(7*8)/8 = 0
9*x+7*8-29 = 0
9*x+27 = 0
(9*x+27)/8 = 0
(9*x+27)/8 = 0 // * 8
9*x+27 = 0
9*x+27 = 0 // - 27
9*x = -27 // : 9
x = -27/9
x = -3
x = -3
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