Can someone pls explain to me Grade 7 algebra could u simplify these: 2.4u + 1.4 = 23, 2x = 50, e-10=80

2.4u + 1.4 = 23 subtract 1.4 from both sides

2.4u = 21.6 divide both sides by 2.4

u = 21.6 / 2.4 = 9

2x = 50 divide both sides by 2

x = 25

e-10=80 add 10 to both sides

e = 90

And another example: 2w-1=11