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x in (-oo:+oo)
x+4*x+7/8 = 11/8 // - 11/8
x+4*x+7/8-(11/8) = 0
x+4*x+7/8-11/8 = 0
5*x-1/2 = 0 // + 1/2
5*x = 1/2 // : 5
x = 1/2/5
x = 1/10
x = 1/10
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