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x in (-oo:+oo)
x/7+x+2 = 5/4 // - 5/4
x/7+x-(5/4)+2 = 0
x/7+x-5/4+2 = 0
8/7*x+3/4 = 0 // - 3/4
8/7*x = -3/4 // : 8/7
x = -3/4/8/7
x = -21/32
x = -21/32
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