Question

4x-(2x+3)=7

Answer 1

4x -(2x+3) = 7
4x -2x -3 = 7
2x = 7+3
2x= 10
x = 10/2
x = 5

Answer 2

i dont get 4x -2x -3 = 7
why do you subtract 3

Answer 3

You need multiply all terms for -:
-(2x +3 )
= -(+2x) - (+3)
= -2x -3
Did you understand?

Answer 4

-(2x+3) is the same thing as -1(2x+3), then multiply -1*2x = -2x,
and then multiply -1*(+3) = -3