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a in (-oo:+oo)
4 = -3*a-(-7/(-8)) // + -3*a-(-7/(-8))
4-(-3*a)-7/(-8) = 0
3*a-7/(-8)+4 = 0
3*a+39/8 = 0 // - 39/8
3*a = -39/8 // : 3
a = -39/8/3
a = -13/8
a = -13/8
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