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12*x-83 = (6*x)/121 // - (6*x)/121
12*x-((6*x)/121)-83 = 0
12*x+(-6/121)*x-83 = 0
1446/121*x-83 = 0 // + 83
1446/121*x = 83 // : 1446/121
x = 83/1446/121
x = 10043/1446
x = 10043/1446
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