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(2/7)*x-1/2 = (-2/7)*x-(3/22) // - (-2/7)*x-(3/22)
(2/7)*x-((-2/7)*x)-1/2+3/22 = 0
(2/7)*x+(2/7)*x-1/2+3/22 = 0
4/7*x-4/11 = 0 // + 4/11
4/7*x = 4/11 // : 4/7
x = 4/11/4/7
x = 7/11
x = 7/11
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