(х+27)-12=42 115-(15+у)=39

Question

(х+27)-12=42

115-(15+у)=39

Answer 1

(х+27)-12=42

х+27=42+12

х+27=54

х=54-27

х=27

 

115-(15+у)=39

15+у=115-39

15+у=76

у=76-15

у=61

Answer 2

(х+27)-12=42

х+27=42+12

х+27=54

х=54-27

х=27

115-(15+у)=39

15+у=115-39

15+у=76

х=76-15

х=61