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a in (-oo:+oo)
(-3/4)*a+7 = 8-a // - 8-a
(-3/4)*a+a-8+7 = 0
1/4*a-1 = 0 // + 1
1/4*a = 1 // : 1/4
a = 1/1/4
a = 4
a = 4
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