a-(3a-2a-5/10)-2a-57/6=-5/3
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a-(3a-2a-5/10)-2a-57/6=-5/3
a- (a-1/2) - 2a - 19/2 = -5/3
a - a - 1/2 - 2a - 19/2 = - 5/3
2a = 5/3 - 19/2 -1/2
2a = -25/3
a = - 25/(3*2)
a = - 25/6
a = 4.167
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