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(-3/2)*a-((17/5)*a) = -441/20 // + -441/20
(-3/2)*a-((17/5)*a)-(-441/20) = 0
(-3/2)*a+(-17/5)*a+441/20 = 0
441/20-49/10*a = 0 // - 441/20
-49/10*a = -441/20 // : -49/10
a = -441/20/(-49/10)
a = 9/2
a = 9/2
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