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x in (-oo:+oo)
(2/7)*(x-(5/4)) = -1/7 // + -1/7
(2/7)*(x-(5/4))-(-1/7) = 0
(2/7)*(x-5/4)+1/7 = 0
2/7*(x-5/4)+1/7 = 0
(2/7*7*(x-5/4))/7+1/7 = 0
2/7*7*(x-5/4)+1 = 0
2*x-3/2 = 0
(2*x-3/2)/7 = 0
(2*x-3/2)/7 = 0 // * 7
2*x-3/2 = 0
2*x-3/2 = 0 // + 3/2
2*x = 3/2 // : 2
x = 3/2/2
x = 3/4
x = 3/4
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