Hello there,
1 side= (4x-3)
3 sides= (4x-3)3
= (12x-9)
To find the value of x,
12x-9= 63
12x= 63+9
12x=72
x=6
On side note: Remember to change the sign when it crosses the equal sign. (for example: -2 will become 2 once it crosses the equal sign)
Hope this helps:))
~Top