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4*(3*x+9) = 60 // - 60
4*(3*x+9)-60 = 0
4*(3*x+9)-60 = 0
12*x-24 = 0
12*x-24 = 0
12*x-24 = 0 // + 24
12*x = 24 // : 12
x = 24/12
x = 2
x = 2
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