как решить 65+(x+23)=105 и ето 9x+50=86 и ето 120:(x-19)=6

65+(x+23)=105x+23=105-65x+23=40x=179x+50=869x=86-509x=36x=4120:(x-19)=6x-19=120:6x-19=20x=20+19x=39

65+x+23=105x=105-23-65x=179x+50=869x=86-509x=36x=4120:(x-19)=6x-19=120:6x-19=20x=20+19x=39