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x in (-oo:+oo)
x+(4/7)*x+3/8 = -13/24 // + -13/24
x+(4/7)*x+3/8-(-13/24) = 0
x+(4/7)*x+3/8+13/24 = 0
11/7*x+11/12 = 0 // - 11/12
11/7*x = -11/12 // : 11/7
x = -11/12/11/7
x = -7/12
x = -7/12
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