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x in (-oo:+oo)
3*x-(2*(5*x-(1/4))) = 1 // - 1
3*x-(2*(5*x-(1/4)))-1 = 0
3*x-2*(5*x-1/4)-1 = 0
3*x-2*(5*x-1/4)-1 = 0
1/2-7*x-1 = 0
-7*x-1/2 = 0
-7*x-1/2 = 0
-7*x-1/2 = 0 // + 1/2
-7*x = 1/2 // : -7
x = 1/2/(-7)
x = -1/14
x = -1/14
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