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a in (-oo:+oo)
7-((3*a)/(-4)) = -10 // + 10
7-((3*a)/(-4))+10 = 0
(3/4)*a+7+10 = 0
3/4*a+17 = 0 // - 17
3/4*a = -17 // : 3/4
a = -17/3/4
a = -68/3
a = -68/3
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