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x in (-oo:+oo)
1/4-((3/7)*x) = -29/28 // + -29/28
1/4-((3/7)*x)-(-29/28) = 0
(-3/7)*x+1/4+29/28 = 0
9/7-3/7*x = 0 // - 9/7
-3/7*x = -9/7 // : -3/7
x = -9/7/(-3/7)
x = 3
x = 3
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