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a in (-oo:+oo)
(-3/4)*a+2 = -5/2 // + -5/2
(-3/4)*a-(-5/2)+2 = 0
(-3/4)*a+5/2+2 = 0
9/2-3/4*a = 0 // - 9/2
-3/4*a = -9/2 // : -3/4
a = -9/2/(-3/4)
a = 6
a = 6
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