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x in (-oo:+oo)
x/7+1 = 9/4 // - 9/4
x/7-(9/4)+1 = 0
x/7-9/4+1 = 0
1/7*x-5/4 = 0 // + 5/4
1/7*x = 5/4 // : 1/7
x = 5/4/1/7
x = 35/4
x = 35/4
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