resolver essa questão 9/5x2x7-20-(7 /5--2/3)x (1-(-5/4))
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9/5x2x7-20-(7/5-2/3)x(1-(-5/4))
9/5x14-20-( (21-10)/15)x(1+5/4)
126/5-20-(11/15)x(4+5)/4
(126 - 100)/20 - (11/15)x(9/4)
26/20 - 99/60
(1560-1980)/1200
-420/1200
-42/120
-21/60
-7/30
9/5x14-20-( (21-10)/15)x(1+5/4)
126/5-20-(11/15)x(4+5)/4
(126 - 100)/20 - (11/15)x(9/4)
26/20 - 99/60
(1560-1980)/1200
-420/1200
-42/120
-21/60
-7/30
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