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212/7 = 3*x-(6*x)+2/7 // - 3*x-(6*x)+2/7
6*x-(3*x)+212/7-(2/7) = 0
6*x-3*x+212/7-2/7 = 0
3*x+30 = 0 // - 30
3*x = -30 // : 3
x = -30/3
x = -10
x = -10
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