а)3,6х+9,2+1,3х+2,5+9,1х=54,43,6х+1,3х+9,1х=54,4-9,2-2,514х=42,7 х=42,7:14 х=3,05 проверка3,6*3,05+9,2+1,3*3,05++2,5+9,1*3,05=54,410,98+9,2+3,965+2,5++27,755=54,4 54,4=54,4166,4:(89-(7х+76,66))==32166,4:(89-7х-76,66)=32 32*89-32*7х-32*76,66==166,42848-224х-2453,12=166,4 224х=2848-2453,13-166,4224х=228,47 х=228,47:224 х=1,02проверка166,4:(89-(7*1,02+76,66))=32166,4:(89-7,14-76,66)=32166,4:5,2=32 32=32