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6*(3*x-10) = 120 // - 120
6*(3*x-10)-120 = 0
6*(3*x-10)-120 = 0
18*x-180 = 0
18*x-180 = 0
18*x-180 = 0 // + 180
18*x = 180 // : 18
x = 180/18
x = 10
x = 10
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