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6*x+7/7+9/7 = (-7*x)/3 // - (-7*x)/3
6*x-((-7*x)/3)+7/7+9/7 = 0
6*x+(7/3)*x+7/7+9/7 = 0
25/3*x+16/7 = 0 // - 16/7
25/3*x = -16/7 // : 25/3
x = -16/7/25/3
x = -48/175
x = -48/175
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