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6 = -x/3-1 // + -x/3-1
1-(-x/3)+6 = 0
(1/3)*x+1+6 = 0
1/3*x+7 = 0 // - 7
1/3*x = -7 // : 1/3
x = -7/1/3
x = -21
x = -21
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