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6*((3*x+6)/7-12)+87 = 2*x-9 // - 2*x-9
6*((3*x+6)/7-12)-(2*x)+9+87 = 0
6*((3*x+6)/7-12)-2*x+9+87 = 0
6*((3*x+6)/7-12)-2*x+9+87 = 0
4/7*x-468/7+9+87 = 0
4/7*x-405/7+87 = 0
4/7*x+204/7 = 0
4/7*x+204/7 = 0
4/7*x+204/7 = 0 // - 204/7
4/7*x = -204/7 // : 4/7
x = -204/7/4/7
x = -51
x = -51
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