1)6|х|+3|х|=272)|12-|х+3||=33) |5х+1|=9

1)6|х|+3|х|=27; 6x+3x=27; 9x=27; x=27:9; x=3. 2)|12-|х+3||=3; 12-x+3=3; 15-x=3; x=15-3; x=12. 3) |5х+1|=9; 5x+1=9; 5x=9-1; 5x=8; x=8:5; x=1,6.