Решите уравнения. (х-+27)-12=42
115-(35+у)=39.
z-35-64=16
28-t+35=53

1) x-27-12=42x-39=42x=81илиx+27-12=42x+15=42x=272) 115-35-y=3980-y=39y=413) z-99=16z=1154) 63-t=53t=10

(х+27)-12=42х+27=42+12х+27=54х=54-27х=27115-(35+у)=3935+у=115-3935+у=76у=76-35у=41z-35-64=16z-35=16+64z-35=80z=80+35z=11528-t+35=5328-t=53-3528-t=18t=28-18t=10