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6*(2*x-9) = -198 // + 198
6*(2*x-9)+198 = 0
6*(2*x-9)+198 = 0
12*x+144 = 0
12*x+144 = 0
12*x+144 = 0 // - 144
12*x = -144 // : 12
x = -144/12
x = -12
x = -12
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