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x in (-oo:+oo)
x+2*x-5/8 = -293/8 // + -293/8
x+2*x-5/8-(-293/8) = 0
x+2*x-5/8+293/8 = 0
3*x+36 = 0 // - 36
3*x = -36 // : 3
x = -36/3
x = -12
x = -12
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