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9*(-1/9)*(x-27)+9*(1/3)*(x+3) = 9*(x+4) // - 9*(x+4)
9*(-1/9)*(x-27)+9*(1/3)*(x+3)-(9*(x+4)) = 0
9*(-1/9)*(x-27)+9*(1/3)*(x+3)-9*(x+4) = 0
3*(x+3)-1*(x-27)-9*(x+4) = 0
3*(x+3)-1*(x-27)-9*(x+4) = 0
2*x-9*x-36+36 = 0
-7*x = 0
-7*x = 0
-7*x = 0 // : -7
x = 0
x = 0
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