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(4/7)*x-(2/3) = -11/21 // + -11/21
(4/7)*x-(2/3)-(-11/21) = 0
(4/7)*x-2/3+11/21 = 0
4/7*x-1/7 = 0 // + 1/7
4/7*x = 1/7 // : 4/7
x = 1/7/4/7
x = 1/4
x = 1/4
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