12x-x=55. 2(x+3)=16. 5(x+3)+7=3(x+12)

Question

12x-x=55. 2(x+3)=16. 5(x+3)+7=3(x+12)

Answer 1

12x-x=55
11x=55
x=55/11=5

2(x+3)=16
2x+6=16
2x=16-6=10
x=10/2=5

5(x+3)+7=3(x+12)
5x+15+7=3x+36
5x-3x=36-22=14
2x=14
x=14/2=7

Answer 2

12х-х=55 11х=55 Х=55:11 Х=5 12*5-5=55 55=55 2(x+3)=16 2х+6=16 2х=16-6 2х=10 Х=10:2 Х=5 2(5+3)=16 16=16 5(x+3)+7=3(x+12) 5х+15+7=3х+36 5х-3х=36-15-7 2х=14 Х=14:2 Х=7 5(7+3)+7=3(7+12) 57=57