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(7*x+7)/7-(x/3)+9 = 0
(7*x+7)/7-x/3+9 = 0
(3*(7*x+7))/(3*7)+(7*(-x))/(3*7)+(3*7*9)/(3*7) = 0
3*(7*x+7)+7*(-x)+3*7*9 = 0
14*x+21+189 = 0
14*x+210 = 0
(14*x+210)/(3*7) = 0
(14*x+210)/(3*7) = 0 // * 3*7
14*x+210 = 0
14*x+210 = 0 // - 210
14*x = -210 // : 14
x = -210/14
x = -15
x = -15
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