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x in (-oo:+oo)
x/7 = 5/4 // - 5/4
x/7-(5/4) = 0
x/7-5/4 = 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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