Решите уравнение (х+27)-- 12=42 115--(35+у)=39
(х+27)+12=42х=42-12-27х=3115+(35+y)=39115+35+y=39y=39-115-35y=-111
Х+27-12=42 х+15=42 х=27 115-35-у=39 80-у=39 у=41
(х + 27) - 12 = 42 115 - (35 + у) = 39 х = 42 - 27 + 12 115 - 35 - 39 = у х = 27 у = 41 (27 + 27) - 12 = 42 115 - (35 + 41) = 39