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3*x+6 = 60/7 // - 60/7
3*x-(60/7)+6 = 0
3*x-60/7+6 = 0
3*x-18/7 = 0 // + 18/7
3*x = 18/7 // : 3
x = 18/7/3
x = 6/7
x = 6/7
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