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(1/7)*x+1/3 = -8/21 // + -8/21
(1/7)*x+1/3-(-8/21) = 0
(1/7)*x+1/3+8/21 = 0
1/7*x+5/7 = 0 // - 5/7
1/7*x = -5/7 // : 1/7
x = -5/7/1/7
x = -5
x = -5
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