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3*x-3 = -27/7 // + -27/7
3*x-(-27/7)-3 = 0
3*x+27/7-3 = 0
3*x+6/7 = 0 // - 6/7
3*x = -6/7 // : 3
x = -6/7/3
x = -2/7
x = -2/7
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