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x in (-oo:+oo)
x/8+5/2 = 7/4 // - 7/4
x/8+5/2-(7/4) = 0
x/8+5/2-7/4 = 0
1/8*x+3/4 = 0 // - 3/4
1/8*x = -3/4 // : 1/8
x = -3/4/1/8
x = -6
x = -6
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