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6*x = 9-(7*(-21/17)) // - 9-(7*(-21/17))
6*x+7*(-21/17)-9 = 0
6*x-300/17 = 0 // + 300/17
6*x = 300/17 // : 6
x = 300/17/6
x = 50/17
x = 50/17
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