Question

[(x+720:8)*5+700]:300= 4
[3*(2x+3)+6*(2x+3)]:5=27
[3*(3x+5)+7]:26=5
2*{27-2*[3x-(42:6-3*2)]+3}=40
  

Answer 1

[(x+90)*5+700]:300=4

(5x+450+700):300=4
(5x+1150):300=4
(5x+1150)=300*4

(5x+1150)=1200

5x=1200-1150

5x=50

x=50:5

x=10

[(6x+9)+(12x+18)]:5=27

(18x+27):5+27

18x=27*5-27

18x=108
x=108:18
x=6

[(9x+15)+7]:26=5
(9x+22):26=5
9x+22=26*5
9x+22=130
9x=130-22
9x=108
x=108:9
x=12