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x in (-oo:+oo)
x = (7/8)*(Y+Z) // - (7/8)*(Y+Z)
x-((7/8)*(Y+Z)) = 0
(-7/8)*(Y+Z)+x = 0
x-7/8*(Y+Z) = 0
x-7/8*(Y+Z) = 0
x-7/8*Y-7/8*Z = 0
x-7/8*Y-7/8*Z = 0
x-7/8*Y-7/8*Z = 0 // + -7/8*Y-7/8*Z
x = -(-7/8*Y-7/8*Z)
x = -(-7/8*Y-7/8*Z)
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