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(5*x-9)/(-3) = -7 // + 7
(5*x-9)/(-3)+7 = 0
(5*x-9)/(-3)+(-3*7)/(-3) = 0
5*x-3*7-9 = 0
5*x-30 = 0
(5*x-30)/(-3) = 0
(5*x-30)/(-3) = 0 // * -3
5*x-30 = 0
5*x-30 = 0 // + 30
5*x = 30 // : 5
x = 30/5
x = 6
x = 6
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