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(1/14)*x-3 = (-3/7)*x // - (-3/7)*x
(1/14)*x-((-3/7)*x)-3 = 0
(1/14)*x+(3/7)*x-3 = 0
1/2*x-3 = 0 // + 3
1/2*x = 3 // : 1/2
x = 3/1/2
x = 6
x = 6
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