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(4/7)*x+(2/3)*x+2 = 16/21 // - 16/21
(4/7)*x+(2/3)*x-(16/21)+2 = 0
(4/7)*x+(2/3)*x-16/21+2 = 0
26/21*x+26/21 = 0 // - 26/21
26/21*x = -26/21 // : 26/21
x = -26/21/26/21
x = -1
x = -1
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