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6*(5*x+7) = 222 // - 222
6*(5*x+7)-222 = 0
6*(5*x+7)-222 = 0
30*x-180 = 0
30*x-180 = 0
30*x-180 = 0 // + 180
30*x = 180 // : 30
x = 180/30
x = 6
x = 6
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