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