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x in (-oo:+oo)
(1/7)*x+1/2 = 15/14 // - 15/14
(1/7)*x+1/2-(15/14) = 0
(1/7)*x+1/2-15/14 = 0
1/7*x-4/7 = 0 // + 4/7
1/7*x = 4/7 // : 1/7
x = 4/7/1/7
x = 4
x = 4
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