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(-2/7)*x+7*x+4 = 101/84 // - 101/84
(-2/7)*x+7*x-(101/84)+4 = 0
(-2/7)*x+7*x-101/84+4 = 0
47/7*x+235/84 = 0 // - 235/84
47/7*x = -235/84 // : 47/7
x = -235/84/47/7
x = -5/12
x = -5/12
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