123 + 300 - 220 + 507 - 210 = 500 1200 – 900 + 45 + 205 - 449 = 1 37 + 55 - 61 + 88 - 119 = 0 5000 – 3000 + 1500 - 2200 + 700 = 2000.

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= – = = – = 2000

( ) -157 = – ( ) =2 ( ) – 371 = – ( ) =2

(24 – х) + 37 = – х = 49 – – х = 12 Х = 24 – 12 Х = (х – 85) = 105 Х – 85 = 105 – 44 Х – 85 = 61 Х = Х = (87 – у) = – у = 103 – – у = 34 У = 87 – 34 У = 53

X Y X Z + Y X Z M Z M K Z

– – 246 – =