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5*(1*x-9) = -25 // + 25
5*(1*x-9)+25 = 0
5*(x-9)+25 = 0
5*(x-9)+25 = 0
5*x-20 = 0
5*x-20 = 0
5*x-20 = 0 // + 20
5*x = 20 // : 5
x = 20/5
x = 4
x = 4
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